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How to repair EH40 timer |
| Use only 600 volt wire. Lamp cord, extension cords are not rated 600 volt. Use copper wire only. Aluminum wire is fire risk and should be avoided or installed by professional. 30 amp breaker use 10 gauge / 120-240 volt 30 amp outlet can be installed on 30 amp breaker only/ use 10 gauge wire ... cannot be connected to 15-20-40 amp breaker.  Orange/ #10 gauge wire, with ground ... 30 amp capacity. Safe maximum: 30 x 80% = 24 amps. Buy: 10-2 gauge/ 30 amp 10-3/ 30 amp Southwire electric tools |
Yellow
12 gauge 20 amp 120 volt 20 amp outlet can be installed on 20 amp breaker, but not 15 amp breaker/ use 12 ga wire. ... cannot be connected to 30-40 amp breaker. 1  Yellow/ #12 gauge wire, with ground ... 20 amp capacity. Safe maximum 16 amps. Buy: 12-2 gauge/ 20 amp 12-3/ 20 amp NMB is house wiring UF is underground Rolls of stranded wire HOOK UP Wires |
White
14 gauge 15 amp 120 volt 15 amp outlet, AFCI, GFCI, timer, switch etc can be installed on 15 or 20 amp breaker. Never connect 15 gauge wire to 20-30-40 amp breaker.  White/ #14 gauge wire, with ground ... 15 amp capacity. Safe maximum 12 amps. Buy: 14-2 gauge/ 15 amp 14-3/ 15 amp NMB is house wiring UF is underground |
| 50-60
amp breaker use 6 gauge / 240 volt 50 outlet can be installed on 50 amp breaker only  Buy: 6-2 wire Southwire electric tools NMB is house wiring UF is underground |
40-50
amp breaker use 8 gauge / 240 volt 40 amp outlet can be installed on 40 or 50 amp breaker only  Buy: 8-2 wire Southwire electric tools NMB is house wiring UF is underground |
  Copper ground wire. Every device, load, metal enclosure etc must be grounded. Ground wire must be continuous throughout installation, never switched on-off, never used as a Neutral wire. Generally ... use same size as other wire in circuit Buy: 12 gauge copper ground wire Ground wire Green ground wire Ground pigtails Ground rods/ ground clamps at Amazon |
 Non metallic flexible cables must carry ground wire, but do not have hazard of short circuit causing injury from shock. Armored steel cable can be used as a grounded connection, and will protect wires from damage. Metal can be energized from an insulation failure. All conduit ...metal, plastic ... flexible and rigid ... must be attached to structure, and attached to enclosures, boxes. Movement, damage and deterioration are major cause of electrical failure. Buy: Non-metallic flexible conduit Power whip Armored cable Southwire armored cable cutter Pull boxes |
 Electrical tools must be insulated. Always best to disconnect power, but insulation failure, lack of proper grounding, grounded neutral, lack of GFCI, out-of-code wiring, generator operating without transfer switch, and other problems still pose a risk to anyone working on electric power ... even when breaker is off. Buy: Electrician tools kits KLEIN TOOLS Tools kits IRWIN tools KNIPEX Telephone cable knife Low Voltage Mounting Bracket for Telephone |
Push-on wire connectors in place of twist-on connectorsBuy:Push on wire connectors Amazon Red 3P connector for 10-14 gauge wire Lever connectors for stranded wire at Amazon HOOK UP Wires |
 Protect wiring from damage Use nipper instead of pliers or screwdriver for removing staples (and nails). Do not damage cable or wires inside cable. -Code says: Cable SHALL BE secured without damage to the outer covering. NEC sec. 336-15 Buy End cutting nippers at Amazon |
  Electrically insulated tools When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistance and heat on wire and creates possible weak point. Buy tools: KLEIN TOOLS Wire strippers at Amazon Electric Wire Stripping Machine Linesman pliers Utility knife at Amazon |
 Multimeters Voltage is tested across two separate wires. Ohms or resistance is tested across both ends of same wire. Amperage is tested along one or two points on same wire. Buy: Analog multimeter Multimeters at Amazon Klein multimeter Electric testers at Amazon Clampmeter for testing amp flow on line |
 GFCI circuit breaker A GFCI circuit breaker will protect all boxes on circuit. Circuit must be grounded. Ground wire must be continuous and connected to each piece of equipment. White wire on circuit breaker must be connected to Neutral busbar inside the breaker panel. Buy GFCI circuit breakers |
Push down 1" wide Push down breaker Plug-in breaker Buy single-pole: Choose from 15 to 60 amp Eaton CL series Siemens 15-60 amp Single-pole tandem breaker Tandem breakers |
Push down 2" wide Push down breaker Plug-in breakers Buy double-pole: Choose from 15 to 125 amp Choose from 15 amp to 200 amp Eaton CL series circuit breaker Siemens circuit breaker Double pole GFCI |
 Larger imageEH40 240Volt timer 30 Amp programmable/ DPST Nema1 indoor enclosure Minimum 1 minute set times Up to 6 on-off per week AA battery for backup and power-outage carryover 1 year limited warranty Override button located on face of timer. Temperature range -40ºF to 104ºF/ back-up battery will fail when exposed to freezing temperatures 7-3/4" high x 3" deep x 5" wide Use 10 gauge wire, 30 amp breaker rated for 4500+ watt element Inductive: 30 Amp, 240 VAC Resistive: 30 Amp, 240 VAC Tungsten: 5 Amp, 240 VAC 1 ½ HP, 240 VAC Reset timer using reset button before programming  If
you are using EH40 for a Load (light, fan, motor, appliance etc) that
consumes more than 30 amps, then timer can overheat and fail.For exampe, EH40 is wrong timer for 2 Hp irrigation pump. You need a 40 amp timer. Resource: How to wire T104 timer If
EH40 is exposed to high heat or freezing temps, then these enviromental
conditions can cause timer to fail. If
EH40 is installed for outdoor use, or a damp location, it can fail. To help reduce problem, install EH40 inside Nema3R weather resistant enclosure. Buy: Nema3R enclosure |
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Basic
troubleshoot steps -Flip circuit breaker fully off and then fully on to make sure timer has power -Test for 240 volts across terminals 1 and 2 -Check AA battery located below the buttons, replace with new, clean terminals -Reset timer and reprogram Buy: Intermatic EH40 timer 30 amp timers Electrical testers Resources: 240V EH40 manual Figure volts amps watts of water heater How to wire EH40 water heater timer Compare all box timers |
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EH40 is battery operated timerBattery compartment located beneath buttonsSize AA battery lasts 2-3 years Clean battery terminals, If terminals are corroded, the timer may be not functional. Clean with white vinegar using q-tip to remove corrosion. Install new battery, reset timer using reset button, reprogram and see if function is restored. Buy: Batteries |
| Check load rating: EH40 is rated for 240 volt AC alternating current at 60Hz (Hz is number of rotations per second of power plant generator: US and Americas 60Hz. Europe, Asia, Africa etc 50 Hz) 30A resistive at 240V AC. 30A inductive (motor, LED) 2.0 hp at 240V AC. 5.0A at 240V AC Tungsten (incandescent light bulb) EH40 is rated for 4500-5500 watt 240 volt water heater |
Is
the Load working? Load is the water heater, motor, light bult etc. Check if load is functioning: by-pass relay terminals and hardwire directly to terminals 1-2 Don't assume override is functioning Do not expose timer to freezing temperatures: battery will fail |
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Is one relay working? EH40 has 2 relays, terminals 3-4 and terminals 5-6... 240 volt circuit has 2 hot wires... and EH40 has 1 relay for each hot wire But 240V load can also be switched on-off using 1 relay If one relay stops working, you can use the other relay and control circuit Test EH40 to see if one relay is still good: First, test terminals 1-2 to makes to sure you have 240V Next, Turn timer ON using the override button Test across terminals 2 and 4 for 240 volt Test across terminals 1 and 6 for 240 volt |
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By-pass
one relay and timer still controls 240 volt If one test reveals 240V and other test reveals 0 volts, then 1 relay is good and other relay is bad. By-pass the bad relay by moving wire from terminal 4 to terminal 3 -or move wire from terminal 6 to terminal 5 Resources: T100 series timers and manuals How to wire T100 series How to set box timers Troubleshoot box timers Trippers and parts Model numbers, and manuals How-to-troubleshoot-Intermatic-timer.html Match wire size and breaker and load Timer caught fire |
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Are there any loose or burned wires?Loose wire will spark and cause carbon deposits, melt end of wire, melt insulation or screw plate or start fire.Prevent major issue by keeping enclosure door closed all all times.... this will reduce damage, starve fire from oxygen and extinguish flames. Cut back melted part of wire, clean up screw plate if possible, reattach wire, use only solid copper wire, never stranded wire, reset timer, change battery and check timer functionality. 10 gauge wire and 30 amp breaker is rated for 4500+ watt water heater Timer is rated 30 amp EH40 does not have a connection terminal for Neutral. Neutral is not needed for 240 volt circuits. |
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Keep wires straight Use solid copper wire If wiring terminal or end of wire are covered with green, use emery board to clean terminal and sandpaper to clean wire. |
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Both wires MUST be same
gauge Straighten each wire If wire is corroded or overheated, clean the end with sandpaper and wipe with cloth. If wire has been melted, cut back and reattach, or replace wire. Tighten screw very tight against copper wire |
Use wire connector |
Use push-on wire connectors |
3
wires/ or different gauge wires Join wires with wire connector or push-on connector Run jumper to screw terminal. Buy: Push on wire connectors at Amazon Red 3P connector (shown) for 10-14 gauge wire Connector assortment Resource: How to select and install wire connector |
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Fire safety/ Do not put stranded
wire under screw plate Do not install stranded wire under screw. Problem1: picture shows 2 different gauge wires under screw plate Problem2: Stranded wire will expand and contract and come loose under screw plate, even if it is the only wire under the screw plate Attach stranded wire and solid wire with wire connector, and run solid copper jumper wire to screw terminal Take photo of wires before starting.  Resources: Timer caught fire Load ratings for Intermatic timers/ pdf |
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 Use
correct wire and breakerUse only 600 volt solid copper wire Match amp load with wire size and breaker All 3 ... amps ... wire size ... and breaker ... must be matched Breakers are rated by amps. Each breaker is
rated for 80% safe maximum
So 30 amp breaker has safe max 30 x .80 = 24 amps Each load (light, motor, appliance etc) has a watt and volt rating. Figure amps for load: If load is 4500 watt
water heater, that is connected to 240 volt ...
then divide 4500 watts by 240 volts = 18.75 amps 18.75 amps exceeds safe max for 20 amp breaker (16 amps) Use 30 amp breaker Each breaker has a corresponding wire size 20 amp breaker: use
12 gauge wire
30 amp breaker: use 10 gauge wire Resources: Wire and breaker sizes Figure volts amps watts for water heater |
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  12 Ga |
10 gauge or 12 gauge? Compare your wire with short pieces of 10 and 12 gauge wire from local box store 10 gauge for 30 amp breaker. 10 gauge wire can have black-white and sometimes black-red 12 gauge for 20 amp breaker 12 gauge will have black and white wires . Resources: Match color code and amp rating for wire Basic house wiring |
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Basic electric safety can include: Adding black tape when White wire carries voltage (applies to 208 and 240V circuits) Why? Black tape on
White wire identifies wire is Hot and not Neutral
 With
120 and 277 Volt
circuits, White wire is Neutral, and Black is HotWith 208 and 240 circuits, both wires are Hot, and both wires carry voltage |
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Never
use aluminum wire Aluminum can only be used if device, timer, outlet, etc is rated CO/AL CO for copper ... AL for aluminum. Intermatic timers are NOT rated for AL aluminum wire |
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Did a surge event cause failure? Nearby lightning strike can destroy electronics throughout facility Make sure all loads and circuit are properly grounded Press reset button, reprogram Install type 1-2 surge protection inside main breaker box Install type 3 surge close to water heater Buy 240 volt/ 7-day: Intermatic EH40 timer at Amazon 30 amp timers Intermatic surge protection Resource: Compare box timers How to wire EH40 timer |
 EH40 can be installed inside a
PLASTIC OR METAL OUTDOOR ENCLOSUREBe mindful that EH40 is battery operated. Batteries grow weak much faster in cold temperatures (for example car battery ... which is rated for cold) The AA battery is not rated for continual exposure to very cold temperatures. However, unlike the standard Nema1 indoor inclosure that comes with EH40, a Nema 3R outdoor enclosure can protect against dust and dirt accumulation, in addition to outdoor rain. Buy: Nema 3R metal enclosure 2T2485GA Nema 3R plastic enclosure 2T2485GA Resources: Boxes and enclosures Code for installing electric boxes Other choices can include the 30 amp ET1700 series Buy: ET1705C/ Steel indoor box/ 30 amp/ 7-day/ SPST programmable/ at Amazon ET1705CPD82/ Plastic outdoor box w/ see-thru door/ 30 amp ET1705CR/ Steel outdoor box/ 30 amp Resource: ET series timers and manuals |
Multimeter Test for breaks in wire/ Test for voltage Most appliance require 80% rated voltage to function correctly Buy Analog multimeter Multimeters at Amazon Klein multimeter Electric testers at Amazon Clampmeter for testing amp flow on line Resource: How to test and replace element How to test thermocouple Element tests for 120 volts How to test wire |
Safety
when testing wires:
Never touch wet or previously flooded appliance. Never stand on wet surface when working on electric. Never stand on bare soil, put down dry boards. Tape tester leads to wood sticks to keep hands away from power. Use non-contact voltage tester before touching wires. Never touch or lean into any made of metal. Remove metal objects from pockets. Do not use oxygen or fuel accelerants in same room as electrical repairs Resource: Basic house wiring |
 Non-contact voltage tester Test for power without touching connectors NEVER assume power is OFF Buy: Non-contact voltage tester Amazon Electric testers at Amazon Resource: How to test electric power is off |
 120 volt 15 amp devices
including GFCI, timers, switches, plugs, wifi controls etc can be
installed on 15 or 20
amp
breaker.120 volt GFCI, outlet, receptacle that is rated 20 amp can be installed on 20 amp breaker only, but NOT on 15 amp breaker. Buy 15 amp GFCI 20 amp GFCI |
Buy Basic electric book Home plumbing/ electrical codes  Or learn about basic household electricity... use and search my site/ Resource Safe electric wiring Basic house wiring |
 Use outlet tester to check for correct wiring on any 120 volt straight-blade outlet. Buy: Klein testers Outlet tester Circuit breaker finder Electric usage monitor |
Twist-on wire connector assortmentsDo not reuse old connectorsTwist wire connector very tight. Pull wires to ensure they will not come loose. Cover all bare copper. Buy: Connector assortment at Amazon Connector assortment at Amazon Resource How to select and install twist-on wire connectors |
Weatherproof wire connectorConnector cavity is full of siliconeBuilt-in cover keeps silicone in place Protect from water, dust etc Buy from my affiliate links Weatherproof size 14 to 6 Amazon Weatherproof size 22 to 8 Amazon Resource How to select and install connectors |
Connect wire to screw terminal Use only 600 volt solid copper wire. Do not use stranded wire or extension cord. Do not use solder anywhere on residential 120-240 volt wiring. Attach electric installation to structure. Tighten screws very tight against wire.  Buy: NEC books Dewalt plumbing/ electrical codes Basic electric book National electric code guide/ illustrated Resources: How to twist wire How to select and install twist-on wire connectors |
 Weatherproof
lever switch on outdoor lightsSafely operate outdoor toggle switch Replaces outdoor cover Install over top of ordinary switch Works with single-pole, double-pole, 3PST, 3-way, 4-way switches etc Use weatherproof box for outdoor Can be used indoor or outdoor Buy: Best choice: Cantex lever switch Outdoor lever switches at Amazon Lever switches Resource Cantex-toggle-switch-covers.pdf Cantex-PVC-junction-boxes.pdf |
Buy: |
Push-on wire connectors in place of twist-on connectorsBuy:Push on wire connectors Amazon Red 3P connector for 10-14 gauge wire Lever connectors for stranded wire at Amazon |
Use nipper instead of pliers or screwdriver for removing staples (and nails). Do not damage cable or wires inside cable. Code -Cable SHALL BE secured without damage to the outer covering. NEC sec. 336-15 Buy End cutting nippers at Amazon |
 When removing insulation from wire, do NOT score or put cuts on surface of copper wire. Doing so increases resistances on wire and creates weak point. Buy tools: Wire strippers at Amazon Linesman pliers Pro linesman plier Needle nose pliers End cutting nippers at Amazon |
 Weather resistant plastic box for outdoor extension cord connections, Christmas lights, outdoor power strip etc . Not for connecting wires with wire nuts®, or in-wall wiring, but can be used indoors to organize extension cords, power strips etc. Weather resistant is not weatherproof or watertight. Use enclosures rated IP65 and IP67 for waterproof. Extension cords cannot be used for permanent wiring. Buy: Large-medium-small electric cord box Socketbox Raintight enclosures Water-tight cord lock Resource: Enclosures and boxes |
 How to wire contactors/ relays |
 How to wire inline fuseholder |
 How to wire delay timers How to wire twin timers |
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Buy Electronics Industrial supplies Tools and home improvement Home and garden Hayward pool Pentair pool Southwire electric |
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Buy
Tools DEWALT Black and Decker Stanley SKIL Makita Porter-Cable Bosch Irwin Hand tools Klein hand tools Fluke electrical testing Dremel hobby tools Campbell Hausfeld air powered Tekton automotive Powerbuilt automotive Saws and saw blades |
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Resource: Compare box timers DPDT timers Intermatic Control water heater w/ Z-wave |
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Resource: Intermatic control centers: and parts Digital control centers and parts Tork control centers and parts Subpanels All control centers and parts Enclosures |
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Resource: Programmable timers Countdown timers Off delay timers On delay timers Timer modules Din rail Twin & one-shot Woods Intermatic Tork |
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Recirculation systems |
 | Buy
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