Question about Honeywell FocusPRO 6000 5-1-1 Day Programmable Thermostat - TH6220D1002

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My honeywell thermostat started blinking on and off......now there is no heat coming out of the furnace. Is the thermostat the problem?

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Posted on Jan 02, 2017

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SOURCE: honeywell round mercury thermostat - heat not coming on

If you tip the mercury switch so that it makes contact and the furnace doesn't start, it isn't the t-stat. Check the connections, then start checking the furnace.
In any case, ditch the mercury t-stat (recycle it properly) and get a new programmable one if at all posible. It will pay for itself many times over by turning your heat down in the middle of the night and back up by morning.

Posted on Feb 10, 2008

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  • 518 Answers

SOURCE: honeywell rth230b won't shut off heat

Sounds like a relay sticking. Possibly in the thermostat or possibly the furnace relay at the furnace. The next time it happens, unplug the thermostat from the wall. If the furnace still runs then it's the furnace relay.

Hope that helps...

Geno

Posted on Mar 07, 2008

  • 147 Answers

SOURCE: I've replaced my very old

Hey John, man that ole T87 has been around for a hundred years and I have installed many of them, but I cant remember the letters on the wiring. Seems to me that it is R-W-Y, any way you will use the R and W. I have a t87 at home still in the box and I could wait till I got home to help you but Im sure its the R and W terminal. Dont forget to set the heat anticipator. Set it the same as the current value of your gas or oil valve.

Posted on Nov 06, 2008

  • 11 Answers

SOURCE: thermostat says ''Aux heat on'' and buzzes when we turn on heat

You most likely have a heat pump, the aux heat (usually electric) comes on anytime the room temperature is 4 degrees below the thermostat setting. Does the buzz go off when the aux heat lite goes out? If the aux heat does not shut off then the primary heater (heat pump) is not putting out enough heat to satisfy the thermostat. I need a little more info. Do you have a heat pump? Is it working?

Posted on Nov 26, 2008

  • 5 Answers

SOURCE: Replacing Round Honewell Mercury Thermostat

try to get one that is made for oil heat, the installation is easy only two wires, and the instructions make it easy.

Posted on Apr 26, 2009

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Honeywell round mercury thermostat - heat not coming on


If you tip the mercury switch so that it makes contact and the furnace doesn't start, it isn't the t-stat. Check the connections, then start checking the furnace.
In any case, ditch the mercury t-stat (recycle it properly) and get a new programmable one if at all posible. It will pay for itself many times over by turning your heat down in the middle of the night and back up by morning.

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