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Posted by on November 28, 2006, 11:19 pm
On 28 Nov 2006 20:02:04 -0800, gm@speakeasy.net wrote:
>Hello:
>
>I have a Honeywell RTH230B thermostat connected to a gas boiler. The
>other day the furnace did not fire when the thermostat called for heat.
> Through the process of elimination I determined that the White-Rodgers
>36c03 gas valve was the problem. The valve was replaced and the system
>is working properly now. While troubleshooting the problem I noticed
>that when the thermostat was calling for heat the voltage at the gas
>valve connection was 24 volts which is what I would expect. However,
>when the thermostat was not calling for heat the voltage at gas valve
>connection was 12 volts. I would expect 0 volts since the themostat
>completes the circuit when it activates the relay that controls the
>heat signal. My real concern is whether the thermostat is defective
>and more importantly whether this constant 12 volts could be what
>caused the gas valve to fail. I checked the voltage at the gas valve
>connection when the gas valve was disconnected and I still saw 12
>volts. Any insight would be greatly appreciated.
>
>Greg
Definately replace the Honeywell with a W/R. You can't use
Honeywells on gas boilers like that. It has to match the valves. If
you had Honeywell valves, that would be different.
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