Question about Electric Intermatic Inc Wh21 Water Heater Timer Single

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I have a problem with my wh21 intermatic hot water heater timer.When it trips off the indicating light is still on dimly and there show low 92 volt on load side.

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There is a short. The timer mechanism is mechanical, so the problem is not failed electronics.
The WH21 is for 240 volt circuits, so it has 2 hot wires and 1 ground from the breaker box. Only one hot line to the water heater is turned off, but both lines are attached to screw terminals at timer.
To see if the problem is a shorted element or shorted wire in water heater, disconnect hot leads to water heater one at a time, and then test. Then disconnect ground wire from water heater and test again. Then disconnect all wires to water heater, and test again.
If the problem is in the water heater, search for troubleshooting steps on internet. Focus on testing elements.
If the problem is not in the water heater, then a frayed wire on back of timer is next checkpoint. The timer motor is the final suspect. You can detach the timer motor from the housing, and test for stray voltage. Intermatic WH21 is inexpensive to replace.

Posted on Aug 26, 2010

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Need to replace stripped gear A4 on Intermatic WH 21


Only parts sold for WH21 timer are clock motor and tripper.
You might be able to find something on ebay... like old non-functioning timer
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-WH21-timer.html

Gene

Water Heater Timers Save Money

May 22, 2014 | Intermatic Hardware & Accessories

1 Answer

If the timer light is on (light is red) does that mean the timer is ON or OFF?


Copy following link for Wh21 manual, troubleshoot walk-thru, and replacement tripper identification.
The red light is a power indicator, and this indicates that timer has 240Volt (208-250Volt) power available, but does not indicate if water heater is ON or OFF.
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-WH21-timer.html

Aug 12, 2012 | Electric Intermatic Wh 21 Water Heater...

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We went on vacation and shut our Intermatic Electronic Water Heater Timer WH21 off, so my daughter wouldnt have a problem in case the power wemt out. We came home and resumed the timer after setting the...


1) If timer dial does not rotate, then clock motor is not getting electricity, or clock motor is bad.
-Make sure time dial is seated correctly. Pull it off firmly and then push in firmly.
-Check circuit breaker is not tripped.
-Test across terminals 1 and 2 on timer for 240Volts.
-Test terminal 1 to ground and then test terminal 2 to ground to make sure each hot wire from breaker has power.
-If circuit breaker is tripped on one leg, the timer can appear to have power, but is only receiving 120V and not the full 240V, so the time dial will not rotate.
-Look for signs of high heat and burning.
-Check that no insulation, and only copper wire are under the screw-down terminal plate.
-Make sure that same gauge wire is used, and that stranded wire and solid copper wire are not under same screw-down terminal plate. The stranded wire will come loose.
http://waterheatertimer.org/B220C.html
http://waterheatertimer.org/How-to-replace-circuit-breaker.html
http://waterheatertimer.org/pdf/wh21-manual.pdf
http://waterheatertimer.org/How-to-troubleshoot-Intermatic-timer.html#fire

2) WH21 is rated for 25 amps and has 1 year limited warranty:
If label on side of water heater shows rating of 5500 watts, then divide by 240Volts = 22.91 amps.
4500 watts = 18.75
http://www.intermatic.com/customer%20service.aspx

3) Replacement clock motor is not shown for WH21 timer.
http://waterheatertimer.org/Intermatic-trippers-and-parts.html#clock-motor

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Sep 18, 2011 | Electric Intermatic Wh 21 Water Heater...

1 Answer

Broken spring


You posted under WH21 Intermatic timer.
Intermatic does not show parts for that timer except 156EB1945A tripper.
http://waterheatertimer.org/Intermatic-trippers-and-parts.html

Jul 17, 2011 | Electric Intermatic Wh 21 Water Heater...

1 Answer

I have a wh21 Intermatic water heater timer. I installed the shut off and on switches. They are not working. I opened a manual and it stated to make sure the dial is pushed all the way in. I spun the dial...


You might have your Line and Load wires reversed.
Line wires come from circuit breaker.
Load wires go to water heater.
http://waterheatertimer.org/B220C.html

WH21 wiring: There are 2 Hot Line wires coming from breaker box that connect to terminals 1 and 2.
WH21 is SPST and turns off one Hot wire going to Load. So Load wires connect to terminals 2 and 3. Terminal 2 has 2 wires: 1 Line wire and 1 Load wire.
http://www.intermatic.com/~/media/files/intermatic/products/instructions/timers/wh21%20-%20english.ashx

Keep in mind that WH21 is 25 amp, 2Hp 240Volt timer that will work on water heaters up to 4500 watts. Look at label on side of tank to see wattage. All appliances and motors have labels.
http://waterheatertimer.org/Figure-Volts-Amps-Watts-for-water-heater.html

Larger wattage water heaters require 30 amp water heater timers as shown following page:
http://waterheatertimer.org/Boxtype.html

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Also take advantage of fixya expert assistance live.
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Feb 21, 2011 | Electric Intermatic Wh 21 Water Heater...

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The spring that turns off the power in my Intermatic WH21 timer is broken. Where can I buy a new spring?


Parts are not available for WH21 240V water heater timer.
Timer has 1 year limited warranty.
http://www.intermatic.com/customer%20service/frequently%20asked%20questions.aspx
WH21 is rated for 25Amps and works on water heaters up to 4500Watts.
Look at label on side of tank to see wattage.
WH21 is SPST and turns off one hot wire to water heater.

I ran a business for many years.
Cost of stocking, organizing, and shipping parts is near same cost as new timer.

Following page shows selection of replacement timers:
http://waterheatertimer.org/Boxtype.html

For example, I have tested WH40 and T104 and other timers that show on page.
Trippers and motors are available for Intermatic box timers WH40 and T104, so you can maintain these specific models for many years.
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi
WH40 and T104 timers are SPDT and turn off both hot wires to water heater.
Both timers will work on any wattage residential water heater

http://waterheatertimer.org/How-to-wire-T104-Intermatic-timer.html
http://waterheatertimer.org/How-to-wire-EH40-hot-water-heater-timer.html

Feb 18, 2011 | Electric Intermatic Wh 21 Water Heater...

1 Answer

This unit (WH21) was installed 1 mth. ago. This is my second unit I've installed with the first being for a friend and his has "NO ISSUES". In the last week mine the second unit has failed to...


You probably have defective timer.
I test timers, and some timers arrive defective.
I have not tested WH21, so check with your friend about the indicator light.

Mechanical dial timers make audible noise, and dial should rotate as time passes and keep exact time. If dial is not rotating correctly on new timer, then something is not working correctly. The level of timer is not an issue. It sounds like the motor gear is not engaging with dial.
To test timer noise, click manual override lever. You will hear same noise each time timer turns on-off.

WH21 is SPST 21amp timer which turns off one hot wire to water heater.
WH21 is rated to work on 4500Watt 18.75 amp water heater. Or smaller wattage.
Check label on side of water heater for wattage. WH21 is not rated for 5500Watt water heater.

There are many water heater timers:
Electronic timers give more precise time control and option for shorter on-off periods.
Electronic timers are quieter and don't need to be reset after power outage.
http://waterheatertimer.org/Boxtype.html

More expensive Intermatic WH40 timer is rated for greater capacity, and has replacement motors and trippers. WH40 is noisy too, but will last for years. WH40 is SPDT so it turns off both hot wires to water heater. I prefer SPDT, and have tested WH40 and other timers shown on link above.
To order extra parts for WH40:
http://www.grainger.com/Grainger/timer-accessories/timers/electrical/ecatalog/N-8hi

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Also take advantage of fixya expert assistance live.
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Feb 16, 2011 | Electric Intermatic Wh 21 Water Heater...

1 Answer

There is a light on the outside of timer should it stay on all the time


1) WH21 manual does not say if indicator lights up when Load is ON. That says indicator lights up when timer has power.
2) Flip manual control to reverse program and see if light stays on or goes off.

3) GE15207 water-heater-timer has two different indicator lights. One is ON when timer has power. The other is ON when Load has power. But GE timer has NO and NC terminals.

4) The reason I answered this question is that folks have problems wiring timers and then ask questions trying to piece together why timer is not working.
5) If timer is not functioning as expected, read below, or add a comment with details about your wiring.

6) Wiring WH21
240V circuits have 2 hot leads.
Hot leads from breaker connect to center terminal and to left terminal.
Leads going to Load (water heater) connect to center terminal and to right terminal
If you have leads from breaker and leads to Load reversed, timer will not function except when manual control is switched ON.
In this case, reverse wires on right and left terminals.

Dec 02, 2010 | Electric Intermatic Wh 21 Water Heater...

1 Answer

Can I use this timer, using only 120 vac to supply a 120 to 12 vac transformer?


no this timer is rated for 240 volts so therfore the clock motor is 240 volts. You will need to purchase a 120 volt clock Good luck!

Sep 11, 2010 | Intermatic Electric Water Heater Timer...

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