Rheem Gas Furnace - No Heat

Old 12-04-16, 03:46 PM
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Rheem Gas Furnace - No Heat

The gas valve, the sensor, igniter and heat exchanger have all been replaced but still get no heat. The furnace runs through the standard procedure as the igniter comes on twice there is the click for gas then the fan blows close to 3 minutes then two more igniters tries then it shuts off. Any thoughts would be greatly appreciated.
Old 12-04-16, 06:32 PM
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Who condemned all those parts? Were they all replaced trying to get the furnace working?
What is incoming gas pressure? Manifold pressure?
Old 12-05-16, 12:11 AM
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Welcome to the forums.

It's good to have many spare parts.

You need to put a voltmeter on the gas valve terminals on the control board and then on the valve. You need to see whether or not you're getting the 24vac and where it's getting lost.
Old 12-05-16, 11:31 AM
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I've just had a somewhat similar problem on a Carrier furnace. The system went to the last operating cycle with pilot light on steady but no flame at burner for no gas to it. Pilot light turned off then the cycle re-started.
It's the gas valve that needed to be replaced. The technician who did the work browsed the diagram on the door, disconnect some wires to the gas valve to isolate it then the fan ran, no fuse blown, etc. His work cost me $320 for testing, part and labor.

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