Question about Honeywell CT87B ROUND HEATING&COOLING MECHANICAL THERMOSTAT - WHITE Heater

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BLOWER FAN WONT SHUT OFF WHEN THERMOSTATE IS OFF

BLOWER FAN WONT SHUT OFF WHEN THERMOSTAT IS OFF. ALSO COOLING MODE TURN ON. I CAN PUSH CONTACTOR IN AND COMPRESSOR WILL COME ON.

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I have a honeywell blower that runs all time it won't shut off unlees I manually shut it off. How do I reset the fan limit control switch so the fan will come on only when the furnace ignitions ignites. Any suggestions.

Tx: Keith

Posted on Jan 15, 2008

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The compressor coming on when the contact is pushed is o.k. they all do that. As for the blower fan not shutting off, some brands (Payne for example) the heating fan relay is a n.c. (normally closed ) relay. so if the time delay relay or thermal link are bad or not connected, the fan will blow even when it is turned off.

Posted on Dec 18, 2007

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2) At the outdoor unit remove the electrical panel to
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hi! there,
blower auto shutting off and on is dependent to thermostat setting,if the thermostat acquired the temperature set it will shut of your blower,checking thermostat performance switch off unit, set this to a lower setting 1 or 0 switch on this should not runof course,if you set up this to 200 this will run until temperature reached to 200 it will stop.when you set up to 1 or 0 and the blower run thermostat is defective.
fan blower relay, if the 3 contactor is short or permanently engage while themostat reached acquired temperature your blower will still running,defenitely relay is defective.relay is dependent to thermostat switching,it supply holding coil terminal is to lock the 3 contactor to supply source to your blower.
so two common option while your blower run continously
1. shut off breaker, disconnect thermostat on two leads,its like a switch.then switch on breaker and run unit.
observe if run, your relay is defective,it was shorted on 3 contactor.
thermostat is the key to run your blower.
2. if the blower not run when you switchn onunit,then switch off again and try to short or connect the two lead using alligator clip on both side,or have it clip the terminals,then switch on again if the blower run,your themostat is defective,the high volatile of filler bulb was leak it always switch on,no play at all to off and on.
have a nice day,don't forget to rate me,thank's
ideas came from actual and theoritical analysis base on experienced and my study of industrial intrumentation.this will guide you and help you,if you understant flow of current in circuit.
have a nice day

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3 Answers

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Your blower fan turning on and off shows your thermostat is working. I am willing to bet you have the fan in the automatic condition. Check for a sticking contactor at the outside unit.

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