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 EJ500 Utilitec Tork ST01C  ST01C ETW350 Aube T1032Aube Intermatic EI500Intermatic
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GE  Leviton Hagar Woods Sylvania

How to Troubleshoot Intermatic timer and replace Intermatic clock motor

water heater element

Never assume power is OFF

Use non-contact voltage tester on timer, on wire, on outlet to see if power is present.
Press button on tester, if single beep then no power is present. If continuous beep then power is present.
Never stand on bare ground, always stand on dry boards, do not hold or touch anything metal when working on timer or water heater that has power, tape tester leads to wood sticks, never touch wet water heater, or flooded water heater, or timer that had a short or fire without turning power OFF.

Multimeters at Amazon
Buy non-contact voltage tester at Amazon
Electric testers at Amazon

Shop Amazon - Industrial and scientific
Shop Amazon - Industrial Electric Products
Override lever

Dial rotates on time

Manual override turns Load ON-OFF

Load turns ON-OFF

Troubleshoot action

1) Yes
Dial rotates on time
If dial is rotating, then electricity to timer is good.
Load turns on-off with override
Load turns on-off
No action
Timer working
2) Yes
Dial rotates on time
Load turns on-off with override
Load turns on-off
But only when using override
Replace trippers.
Check copper wire at terminals
3) Dial rotates
But not keeping time
Load turns on-off with override
Load turns on-off
But not at scheduled time
Replace clock motor.
How to replace clock motor
Check loose wires
Check circuit breaker
Reset clock after power outage
4) Yes
Dial rotates on time
Load turns on-off with override
Turns ON but not OFF -or-
turns OFF but not ON
Replace trippers
Intermatic trippers and parts
5) Yes
Dial rotates on time
Load does not turn on-or-off,
But override snaps crisp-n-clean
Load does not turn on-or-off
Check breaker and power to Load;
Check Load is working
Test for voltage going to load.
Check for loose wires
6) Dial rotates
But stops after tripper passes
Load turns on-off with override
Until dial stops
Check Wiring.
Line and Load wires are reversed.
(Line wires are from breaker. Load wires go to electrical device.)
7) NO
Dial not rotating
Load turns on-off with override
But with override lever only
Replace clock motor
How to replace clock motor
8) NO
Dial not rotating
No No
Load does not turn on-off
Check wiring
How to wire T100 series
How to wire Sprinkler timers
More timer wiring
Check circuit breaker and power to timer
How to replace circuit breaker
Check wires at terminals
Use nose to smell for burned connection
Burned wires, scroll down on page.
9) Yes/NO
Dial not rotating
Lever is sluggish or stuck and will not move Yes/No
Load does not turn on-off
Turn off power, spray WD-40 on lever and gears, replace clock motor, buy new timer
10) Timer wires are burned and melted
Scroll down on this page
Chart as pdf

Intermatic Pointer is stationary

Remove dial, Clean Timer and add white grease: See photos

Pointer was accidently moved

T100 series pointer points straight down to 6 o'clock
Sprinkler timer pointers point to 7 o'clock

Lift and rotate dial clockwise until current time lines up with with siilver pointer

How to operate and set T104 timer
How to wire Sprinkler timer
Other things to check with timers:
1) Check light bulb. Check wall outlet. Use non-contact tester to check if power is live.
2) Check timer override: Move override lever, or push override button, should cause Load to turn ON even if clock motor is bad.
How to replace clock motor     Modular clock motors
3) Flip circuit breaker all the way off, then back on.
4) Wiggle circuit breaker and listen for crackling sound, and use nose to smell for electrical burning.
5) Tighten wire(s) on circuit breaker
6) Move wire(s) on breaker to different same-size breaker.
7) Check load rating of timer, and compare with load demand. Check if wire size and load size match.
Load-ratings-for-Intermatic.pdf    Color-code-for-wire.html
8) Reset GFCI. Check if circuit is on a GFCI breaker, or GFCI outlet located in bathroom or kitchen.
9) Open timer box or remove timer cover and check if wires are burned, if wire nuts are loose, or if terminal screws are loose, and use nose to smell for indication of electrical burning.
10) If you have analog timer, look if dial is rotating. If dial is rotating, then clock motor is good, but trippers may be bad.
11) Prevent power SURGE damage to timers, water heater, appliances, circuit breakers, main breaker panel, household wires etc

Other things to check with timers

Remove trippers from dial and push manual override lever to ON position.

Use this technique if your water heater will not function and you want to test water heater circuit, or if you want water heater turned ON full time while guests are in town.

How to override dial-type mechanical timer

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Intermatic T104P201 pool timer
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Pool timers and manuals

More resources

How to operate and set T104 timer
How to wire Intermatic T100 series timers
How to wire Intermatic T1905 and T1906
How to wire Intermatic WH40 and EH40 and EH10
How to wire several brands of box timers

Troubleshoot power from circuit breaker to water heater
Replace circuit breaker
See basic water heater circuit
Box-type water heater timers

Timer making noise

Timer making noise

Spray gears with WD40. Or blow out timer with air. See image of gears
Turn off power: WD40 vapor is highly flammable accelerant. Do not spray WD40 on live electric connections or hot surface.
Open timer door. Spray metal gears located under the yellow dial.
Then use thumb spring located top inside box to release mechanism.
Tip out mechanism. Clock motor gears are located on back of mechanism.
If removing wires, read information below to prevent fire hazard.

Timer mechanism
Larger image

How to replace Intermatic clock motor

2) Release mechanism from box using thumbspring located inside top of box
3) Look at WG number printer on timer
4) web search that specific number

Intermatic metal enclosure
Replacement boxes and other Intermatic parts
WG1573 clock motor
Look for clock number
WH40 clock motor
Consumes 3 watts power

Identify Clock motor: model number

Numbers appear on back of motor
WG1573 240 volt consumes 3 watts of power

Identify clock by timer model number:

Clocks Motors and accessories/ pdf
Clock motors3 pdf
Applies to T104, T174, WH40, pool timers etc
WG1573 208-240Volt at Amazon

WG1570 120Volt at Amazon
WG1576 480Volt at Amazon
CW1570 24V at Aplus
WG1571 motor for 50 Hz 120Volt at Aplus
WG1574 motor for 50Hz 208-277V Amazon
WG430 120 volt
WG433 / 240 Volt with long leads
Applies to WH21:
WH233-18 clock motor at Intermatic
Applies to Sprinkler timers &T1900 & T1970 series
125Volt WG730 motor at Amazon
208-240volt WG733 motor at Amazon
480V WG736 clock motor at Amazon
T1800 sereis
125Volt WG430-20 at Amazon
208-277 Volt WG433-20 at Amazon
C8800 series cycle timer
WG770 125V clock motor for C8865-6
WG773 208-277V for C8866
WG780 C8835 125V at Amazon
WG750 C8845 125V clock motor at Amazon
WG790 125 volt clock motor for C8815 15-minute timer
T7400 7-day series:
WG1600 125V motor at Amazon
WG1603 208-277V motor

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Clock motor held in place with 2 star-screws

Image on left shows typical WH40 and T100 series timers

Remove 2 screws
Buy star screwdriver from auto parts store or hardware store.

Clock wires connect to terminals on front of timer
Make sure clock wires do not interfere with moving parts
Tighten all screws very tight
Read next section below to safely reconnect wires to timer.
Recycle, so products don't end up in your food.
12-3 wire

Know your wire sizes and amp ratings.

Wires and cables are color-coded.
See wire size amp chart
Figure volts amps watts for water heater or any appliance
Fire inside Intermatic timer
WH40 water heater timer

Avoid fire inside Intermatic timer

1000 house fies each day in US
1) Treat timer as a circuit breaker box, and keep enclosure door closed, and keep terminals screws covered with plastic insulator.
All elecrtrical boxes are covered to contain overheating and potential source of fire.
If wires overheat, then closed door contains fire by starving fire of oxygen.
Without oxygen, the fire cannot spread.
Door also keeps melted material from falling out of enclosure and onto nearby flammables.

2) Use romex connectors where wire enters enclosure.
Tighten romex connector against wires so wires cannot pull loose.

3) Know amp rating of timer by reading information on inside of timer door.
Match wire size to amp rating of wire. Match amp rating to nameplate rating of water heater or pump that is controlled by timer.

Fire safety/ only solid copper wire under screw plate

Use only solid copper wire
Do not put insulation under screw terminal

Take photo of wires before starting
Insdulation under screw plate
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Fire safety/ maximum 2 solid copper wires under screw plate

Max 2 wires under screrw plate
Each wire must be same gauge
Attach multiple wires with wire nut, and run jumper to screw terminal
Wire and breaker size charts

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Fire safety/ Do not put stranded wire under screw plate

Do not install stranded wire under screw
Attach stranded wire and solid wire with wire nut, and run solid copper jumper wire to screw terminal
Take photo of wires before starting
Contact Intermatic
Load ratings for Intermatic timers/ pdf
Warranty claims/ on-line
Product registration

Wire and breaker size charts

Fire inside Intermatic timer

Check amp rating of timer by reading information inside timer door,
WH40 and T100 series is 40 amps, other Intermatic timers can be more or less.
Check amp rating of Load and Breaker, check wire size, check that wires are installed corectly on timer.
T100 series mechanism only
Snap into old box

Timer mechanism only: usually cheaper to buy whole timer

Buy mechanism and snap into existing enclosure
T100 series mechanism is sold separately.
T104 timer = order T104M
T103 timer = order T103M etc.

Necessary only if gears are rusted and manual override lever does not snap crisp and clean.
New trippers and clock motor are cheaper than buying mechanism.

Fire-damaged timer can be replace with mechanism, without changing enclosure.

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Yellow dial rotates as time passes, and the Off and ON trippers push lever that causes timer to operate. Clock motor operates dial and will keep correct time for years.
Image shows typical WH40 and T100 series

Tripper identification numbers

Intermatic 156T1978A tripper

Intermatic R8806P101C Sprinkler timer
Larger image
T8845PV larger image

Sprinkler timers

When planning watering times it is important to understand how the timer works. The timer just turns on-and-off, and each time the timer turns off, the sprinkler valve automatically advances to next zone. So the sprinkler valve is doing the mechanical job of advancing through each zone.

Rain sensor is not supplied with timer. Buy separate rain sensor. The rain sensor plugs into standard outlet. Connect the wires from rain sensor to terminals on timer. Do not apply voltage to rain sensor terminals.

T8845PV has 24Volt transformer with two yellow wires. Connect yellow wires to sprinkler solinoid. Connect 120Volt power to terminals marked Line and Neutral. Line is the black hot wire. Neutral is the white wire. Do not connect power to yellow wires.

Intermatic sprinkler timer manuals and parts and wiring
How to set and troubleshoot sprinkler timers/ pdf

More parts
Intermatic 119T86A Transformer for sprinkler timer
119T86A Transformer at Amazon
Intermatic 156T1950A tripper
156T1950A trippers at Amazon
156T1950A trippers at Intermatic
Intermatic clock motor
Buy clock motors:
240volt WG733 motor at Amazon
125Volt WG730 motor at Amazon
480Volt WG736 for R8800 series at Amazon
Intermatic 124T2097 Plastic-Insulator
124T2097 insulator
124T2097 at Amazon

How to install insulator
All brands of timers including Intermatic sprinkler:
With 120Volts, Line is the black hot wire. And Neutral is the white wire. Connect the black and white wires to terminals marked Line and Neutral.
With 240Volts, both wires from breaker are hot Line wires. L1 and L2. Either hot wire can connect to either terminal without regard to wire color.
Intermatic trippers

Intermatic trippers and parts

Intermatic trippers and parts
Intermatic P1353 timer
Timer segments

How to set, wire, troubleshoot timers

How to set timers
How to wire timers
How to troubleshoot timer
How to wire switches
How to wire GFCI

Power packs

Troubleshoot IntermaticMalibu power packs
ML power pack trippers

Wall timers

Intermatic ST01C
Intermatic EJ500
All in-wall Intermatic timers
If lights blink, then timer is wired wrong. See wiring illustrations
Replace Intermatic timer batteries

Countdown timers

Countdown timer horsepower ratings
All in-wall Intermatic timers

Replace Intermatic timer module

Modules are held in place with 2 screws
Intermatic PB series
Larger image
Intermatic timers and manuals

Intermatic PB800-900 model numbers/ pdf
Intermatic PB series wiring digrams
PB800-900 series on-line

PB800-900 sell sheet with discontinued numbers pdf

2 terminals for clock motor
120V or 240V models
2 independent termianls for load
Any voltage, 120, 240, etc

How to set analog timers
178T24 thermostat wiring
Timer module controls Freeze thermostat wiring.
Typical manual

Additional links
How to wire Intermatic T100 series and T170 series timers
How to wire Intermatic Sprinkler timers
How to wire WH40, EH40, EH10, WH21 timers
How to wire Intermatic ET series timers
How to wire Intermatic GM40 and WHQ timers
How to wire T1906, T1905, T1975, T1976 timers
How to wire Intermatic ST01C, Ei600, EJ500 timers
How to wire Intermatic/Malibu timers
How to wire Intermatic FM1 timer
How to wire Intermatic PB300 series timer
How to wire Intermatic whole house surge
How to wire remote control timer
How to wire 3 phase timer
How to wire GE 15312 timer
How to wire GE 15207 timer
How to wire GE Box timers

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Romex connector

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Intermatic timer enclosures

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9+ ways to save with water heater

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Motorized shut off valve
Cutler Hammer C25BUB230A

Electricity from pole to breaker box

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Compare all water heater timers
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Cost to operate gas and electric water heaters
Compare timers
Water heater Box timers

Intermatic parts
Intermatic trippers and parts
 Dayton Power pack
GE box timers
Wire T1906 and T1905 timers
Wire T-101 T103 T104 timers
Paragon timers and manuals
Tork TU universal timer
Westek box timers
Wire EH40 and WH40 timers
Tork timers and manuals
Tork TU universal timer
Troubleshoot intermatic
Sylvania timers

How to set analog  timers
Pool timers and manuals
Intermatic T104P201
Intermatic sprinkler timers
Wire GE 15207 timer
How to wire Tork DTU40
How to wire Intermatic GM40
Intermatic GM series
Westinghouse timers
Westinghouse timers
Timex timers
Brinks timers
3-phase timer
3-phase timer
Gas and electric water heaters Support the economy:
Buy water heaters  from my associate links:

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Hybrid / heat pump/ water heaters at Amazon

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