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Old 12-27-2008, 11:23 PM   #1
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HELP!! My thermostat isn't turning my furnace off!!


Help,

I came home today to find my house was 87 degrees and climbing even though the thermostat had been set to 65.

I have a gas furnace with 2 zone heating. Zone 2 works perfectly, but zone 1 will not shut off.

This thermostat has worked great for over a year and was installed new. It is a Honeywell RTH74000 and I have never had any problems with it.

1. I have turned the heat off and the furnace still turns on every couple of minutes.

2. I have turned the system to cool and the furnace still turns on every couple of minutes.

I have checked the settings as specified by the Honeywell site and they are correct. This problem just occurred today and I can't get someone in to look at it until Monday.

Right now I have a house fan blowing the hot air, and my money, outside to keep the house at a comfortable temperature.

Any help this form can give me is appreciated!

Thanks!

-Dan

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Old 12-28-2008, 05:50 AM   #2
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HELP!! My thermostat isn't turning my furnace off!!


Disconnect the stat, and see if the furnace stops coming on for that zone.

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Old 12-28-2008, 09:23 AM   #3
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HELP!! My thermostat isn't turning my furnace off!!


Thanks! I am so afraid of screwing something up. Since I installed the thermostat I should be able to disconnect it.

Thermostat is disconnected.. Waiting for furnace to see if it turns on every so often.

How can I tell if it is turning on for that zone? I have the other zone set to 55 in order to have the heat not turn on.

Furnace just kicked on. Not sure for what zone or purpose.
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Old 12-28-2008, 09:26 AM   #4
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HELP!! My thermostat isn't turning my furnace off!!


Ok, so Thermostat disconnected but furnace still turns on. The heaters in the other zone are off so it's not heating them.

Now what??

Thanks everyone for your advice.

-Dan
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Old 12-28-2008, 09:42 AM   #5
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HELP!! My thermostat isn't turning my furnace off!!


Are the radiators in the "bad" zone still heating up with the thermostat disconnected? You might have a shorted wire somewhere.

It is not unusual to find wires crushed behind the thermostat back plate and the wall and shorts can happen there.

Many furnaces will cycle on and off on their own schedule so the boiler or water jacket temperature stays somewhat constant. But it should not cycle on every five minutes.

Forced hot water and steam furnaces have internal thermostats called aquastats to control the boiler temperature. Adjusting and replacing these is usually a job for experts.

Turn off the furnace master switch or breaker for an hour or so every so often to minimize wasted fuel.
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Last edited by AllanJ; 12-28-2008 at 09:48 AM.
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Old 12-28-2008, 09:47 AM   #6
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HELP!! My thermostat isn't turning my furnace off!!


The heaters in the bad zone are still giving off heat. The furnace cycles on every 5-7 minutes an shows no signs of stopping.

Thanks,
Dan
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Old 12-28-2008, 10:04 AM   #7
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HELP!! My thermostat isn't turning my furnace off!!


I just turned off the master switch and everything stopped.

I put in another call to my plumber who should call me back on Monday.

good news is, it is 65 degrees out today and 45 tomorrow so we shouldn't need the heater on.

Thanks Allen and beenthere for your help.


-Dan
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Old 12-28-2008, 10:14 AM   #8
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HELP!! My thermostat isn't turning my furnace off!!


Probably a zone valve stuck open with the end switch closed. If you can locate this valve you may be able to free it up.
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Old 12-28-2008, 11:09 AM   #9
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HELP!! My thermostat isn't turning my furnace off!!


Quote:
Originally Posted by SKIP4661 View Post
Probably a zone valve stuck open with the end switch closed. If you can locate this valve you may be able to free it up.


Both Zone valves look the same with the switch in the up position.

They are the ones that look like little beehives right?
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Old 12-28-2008, 11:56 AM   #10
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HELP!! My thermostat isn't turning my furnace off!!


If your refering to the Taco zone valve.
The manual level, doesn't move, unless you move it.
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Old 12-28-2008, 06:31 PM   #11
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HELP!! My thermostat isn't turning my furnace off!!


Quote:
Originally Posted by beenthere View Post
If your refering to the Taco zone valve.
The manual level, doesn't move, unless you move it.
Can i use the taco valve to shut down one zone but run the other zone?
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Old 12-28-2008, 06:41 PM   #12
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HELP!! My thermostat isn't turning my furnace off!!


Depends, on why its sticking/staying open.

Remove the wire from the 1 terminal, and keep the lever up.

If its a problem with the power head, that will stop the heat.

If its a problem with the valve seat, it will still give you heat when the other zone calls.
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Old 12-29-2008, 07:56 PM   #13
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HELP!! My thermostat isn't turning my furnace off!!


Ok,

So the resolution to the story is that the heating tech came today we flipped the switch on the boiler and everything is working perfectly without any repairs!

So whatever it was I am out 100$ for the visit even though nothing was wrong at the time to the visit.

Here is hoping it was just a glitch that was worked out by being powered off.

All in all I am just happy the thing is working.
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Old 12-29-2008, 09:44 PM   #14
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HELP!! My thermostat isn't turning my furnace off!!


It will stick again.
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Old 12-29-2008, 11:12 PM   #15
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HELP!! My thermostat isn't turning my furnace off!!


ditto

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