Simple Honeywell St9120C4057 Wiring Diagram ST9120U1011 Universal Electronic Fan Timer - Honeywell ForwardThinking

Simple Honeywell St9120C4057 Wiring Diagram ST9120U1011 Universal Electronic Fan Timer - Honeywell ForwardThinking
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Simple Honeywell St9120C4057 Wiring Diagram ST9120U1011 Universal Electronic Fan Timer - Honeywell ForwardThinking - This website makes use of cookies to deliver our offerings and to show you relevant ads and job listings. By means of the use of our website, you well known that you have study and understand our cookie coverage, privateness coverage, and our terms of service. Your use of stack overflow’s services and products, consisting of the stack overflow community, is challenge to these regulations and phrases. I did not suspect the thermostat became responsible for the ac no-blower difficulty but since the fan automobile/on switch changed into intermittent, i changed the thermostat with a brand new digital thermostat (honeywell rth2300 b). With new thermostat, no changes determined... Warmth still working, and fan/blower (alone) nonetheless running, and no-blower with ac on. Ac out of doors fan and compressor still seem like operating exceptional.

I verified the blower/fan wiring and it became as tester101 said: a black twine was on the cool terminal. The black cord runs the blower on excessive velocity. A blue wire become on the heat terminal. The blue wire runs the blower on medium speed. A red cord become at the m1 terminal. The red twine runs the blower on low velocity (lowest speed). With thermostat warmness/off/cool switch set to warmness, and fan car/on switch set to vehicle, warmth runs generally: interior blower/fan is off, gas valve turns on, furnace ignites. After a few delay, blower starts offevolved and runs normally. Then, set thermostat warmth/off/cool switch to off. Gas valve turns off, blower keeps to run for a while, then blower shuts off.

With thermostat warmth/off/cool switch set to chill, and fan vehicle/on switch set to automobile, outdoor ac fan and compressor start and run commonly, inside blower in no way starts offevolved. Even as outdoor ac fan and compressor are going for walks, turning fan car/on transfer to on has no impact (inside blower stays off). Checking out: first i placed a jumper from g to r and depressed the interlock switch to allow strength to the gadget. After a completely brief delay (about one-half of to at least one 2nd), the inside blower/fan started up. I checked the voltage on the warmth terminal and determined 120 vac.

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