Question about Intermatic Inc. ST01C Digital In-Wall Timer

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Does not turn on exhaust fan motor in bathroom. Display functions work. Could it be the battery or the unit?

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The problem can be either battery or timer.
Several people wrote fixya over past months saying that ST01C failed completely after installing new CR2 battery.
http://waterheatertimer.org/ST01C-program.html#battery

Battery operated timer, then weak battery can cause timer to malfunction.
ST01C troubleshoot says BATT advisory does not always display.
ST01C has 1 year warranty.

Advantage of battery-operated timer is simple wiring when box does not have neutral or ground wire.
Battery-operated Intermatic EI600 has 5 year warranty
http://www.intermatic.com/products/timers/in-wall%20timers/electronic%207-day%20astro%20time%20switches.aspx
Honeywell Aube T-1032 7-day timer has internal rechargeable battery
http://waterheatertimer.org/Aube-timers.html

Posted on Nov 14, 2010

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When Exhaust button pressed, vent fans not working, but microwave running for 30 seconds.


test the components and fix it. God bless you


  1. Exhaust fan motorIf your exhaust fan motor is not running, there are a couple of things that you can check involving the motor to locate the problem. After removing the fan motor, you can manually attempt to turn the fan blades with your hand. If the fan motor is working properly, the blades should spin effortlessly. If this does not occur and the blades are taught, the motor will need to be replaced. Secondly, the fan motor itself can burn out due to time and usage. Using an ohm meter, the exhaust fan motor should read open for continuity. If it does not, then the fan motor has expired and will need to be replaced.
  2. ThermostatAnother part that could cause the microwave exhaust fan to not work is a faulty thermostat. A thermostat gauges the air temperature, which activates the exhaust fan when required. If this part becomes flawed, the exhaust fan will not energize and the thermostat will need to be replaced.
  3. Main control boardIf your exhaust fan is still not working and the microwave fan motor, wiring, and thermostat are operating accurately, the root cause could be with the main control board. Replace the main control board.

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Dear Sir , the dehumidifier is running the motor is running, but not sending out any water. I have cleaned the filter.n Any recommendations?


Is it only the fan motor running that you hear? Or is it the compressor motor and the fan motor in combination?

If it's just the fan motor, it running to circulate the air, in an effort to sense humidity in the air, above the level you have the humidifier set on. Speaking of which, you may have the level set higher than what the humidity is in the house and the unit is just maintaining it. 50 to 60% is high, as opposed to 35%, which is what most folks want to maintain in the hot, humid, summer months.

If you want to test the unit, place in the bathroom, turn a hot shower ON, turn the humidifier ON and set it for 45% or minimum if your unit does not have a LED readout screen. Do Not turn the bathroom exhaust fan ON. As you leave the bathroom, close the door and don't return for 20 minutes. When you do, turn the shower OFF and check the humidifiers water collection bucket. If you see any water, the unit is working as it should. If you don't see any water, it's time to replace that unit. I say that because, at best, the parts and labor to repair the unit would be equal to or almost equal to, the price of a new dehumidifier.

Hope this helped you troubleshoot and solve the problem. Please let me know. Thanks

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Hello,
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The part can be easily purchase here...

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