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Old 10-07-2008, 05:30 PM   #1
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No heat


Forced hot water heat w/baseboard. When the thermostat is turned up the heat will not go on. I am thinking a bad thermostat or the zone valve.Any ideas on how to test ???

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Old 10-07-2008, 05:48 PM   #2
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No heat


I can't help. I only do forced air systems.

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Old 10-07-2008, 08:04 PM   #3
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No heat


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Originally Posted by cozack View Post
Forced hot water heat w/baseboard. When the thermostat is turned up the heat will not go on. I am thinking a bad thermostat or the zone valve.Any ideas on how to test ???
How is the water heated? Do the other zones work?
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Old 10-07-2008, 08:30 PM   #4
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No heat


You didn't mention what you are using for heat, oil or gas. Either way, easiest way to test is to jump thermostat connections at burner. If burner fires, most likely zone valve motor has failed. This is very common and easily repaired. Another possibility could be sticking zone valve stem. If zone valve is easily accessible, remove motor and turn up thermostat. Little gear on bottom of motor should turn. If it does not, replace motor. If it does, take some lightweight oil and put a couple drops on zone valve stem and work it manually a few times to loosen it up. This will often get the valve working again after a long summer of inactivity. Easy way to test if thermostat is working is to turn it up, locate thermostat wire at zone valve, disconnect wires and check with ohm meter. Should have continuity. If not, either thermostat has failed, or thermostat wire has broken or been chewed by rodents.
good luck, post back if needed. Many other possibilities exist, but lets try to keep it simple starting out.
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