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RUUD heater The heater will run for about 20 to 30 minutes then it will cycle on and off. The igniter lights every time. It turns on the gas but only stays on for about 5 seconds then shuts off. The fan comes on for about 2 minutes then the cycle starts all over again.

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Sounds like a dirty flame sense rod. Be sure to shut off power before removing the rod and cleaning it with sandpaper or steel wool. Do not touch or disturb the hot surface ignitor or you may cause it to fail.

Posted on Jan 02, 2009

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I have a 20 year old Ruud gas water heater with a power vent. The model is PVP 40-1. Sometimes it will not heat water. The power vent is running but neither the ignitor or the burner is. If I turn off the...


My guess is the ignitor needs replacing (old and has built up too much internal resistance). Even though it still works at times, I would suspect it first, even if it glows during an ignition cycle.

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1) Copy following link to troubleshoot by type of gas control valve:
http://waterheatertimer.org/How-to-troubleshoot-gas-water-heater.html#intellivent

2) Otherwise Rheem-Ruud does not post service manuals
http://www.ruud.com/products/tank_water_heaters/gas_water_heaters/

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It sounds like the first thing to do is have burners and pilot cleaned and adjusted so ignitor and pilot flame is close to main burner ignition rail.

The "whoosh" is due to delayed ignition because the pilot flame does not come in contact with main gas.

One more thing that should be tested is the gas pressure and combustable air mixture to be sure it is correct.

It is always best to have a qualified technician do this for you, In many areas the gas supplier with check and safety test this for you.

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Flip the lower panel over and look for a wiring diagram. On that diagram there will be a diagnostic chart. Let me know what 5 blinks represent. Then I want you to read on.

On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).

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Look on the wiring diagram for a description of the error codes. It will give you a starting point where the problem is.

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Hi jim if you are smelling fumes turn it off and get a service done on it asap

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Your furnace is going into a lockout condition, cycling the power resets the circuit board and it starts over. I will need to know approximate age and model of your furnace, it sounds like you have need to clean the flame sensor rod. However i need to know what i am working with.

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