Gas and Oil Home Heating Furnaces - Power Vent Water Heater

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kadman
01-25-04, 10:49 AM
I have a power vent water heater and the power vent fan does not shut off. Everything seems to be working fine but the vent fan never shuts off. Any ideas?

artbuc
01-25-04, 03:31 PM
Do you have the vent motor plugged into a wall outlet instead of the switched outlet on the hot water heater?
goldstar
01-26-04, 10:17 AM
I looked at the wiring diagram on my power vent water heater and it appears that the blower is controlled by the thermostat. Sounds like a sticking switch or relay.

Ed Imeduc
01-26-04, 10:34 AM
On that wire schematic does the tstat turn on the burner also? Is you water to hot? if not look for that fan relay. I find water heater tstat are not the best in the world.;) ED
goldstar
01-26-04, 02:57 PM
Don't know if kadman has the same type of water heater. Mine is a Rheem. It looks like when there is a call for heat, the thermo starts the blower. The blower causes a partial vacuum in the stack. This pulls in a diaphram which then allows 24 volts to be fed to the gas controller. the controller then does it's thing with the electronic ignition and gas flow etc.
kadman
01-26-04, 07:04 PM
Thanks for the input everyone. Goldstar hit it right on the head. After a long search I found the manual to the heater. Traced the schematic and found the gas pressure switch was stuck. I tapped on it with a screw driver and bam...everything back in working order. I'm going to do some checking and try and get a new switch but everything is working for now. Thanks Again