Rheem gas heater unit non ignition
Posted 04 March 2011 - 01:52 PM
Posted 04 March 2011 - 07:39 PM
Newer models use a flame sensor. The sensor gets contamination on it which coats the sensor and throws off the resistance readings back to the control. Cleaning it with sand cloth or dry brillo pad will sometimes get her back up and running until yall can get a new flame sensor installed.
Edited by applianceman18007260692, 04 March 2011 - 07:41 PM.
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Posted 04 March 2011 - 07:48 PM
Edited by Nicky, 04 March 2011 - 07:52 PM.
Posted 04 March 2011 - 10:31 PM
# 1 . if you have a separate spark module(separate from the main circuit board), then maybe the spark module is malfunctioning.
# 2 if the spark function is part of the main circuit board , then your problem is the main circuit board.
# 3 Main burner side of gas valve is failed.
All Post 1990 spark ignition systems that I have seen (in my neck of Louisiana ) work in the same way. They spark(sometimes for a long time on older models ) , Pilot flame ignites, then (sometimes after a delay) , main burners ignite.
Spark ignition systems may not have any sort of flame sensor that you can fix or clean( Flame sensing is built into the spark sensing circuit and not a seperate rod on the end of the burners), .......
SO, if you get spark, and then pilot flame and then no main burners, put a meter on the gas valve and look for 24 volts ac when the gas valve should be opening. If you get voltage at that point then the valve is bad . if you never get voltage there it is the spark module or main circuit board( Suspect whatever part that makes the spark).
Good luck ,
And happy Mardi Gras
Posted 04 March 2011 - 11:28 PM
Posted 05 March 2011 - 09:45 AM
From what you are describing , the spark control is sensing very little or no flame signal from the pilot flame.
And Yes, Once the control senses a stable pilot flame , the main gas valve will be opened(this could be very fast , or it could take 5 to 10 seconds, older models sometimes had long delays till main gas valve opening
there are several things you can check on the flame sensing circuit .
Spark systems sense flame via chasis ground. ANY CORROSION will mess up the flame sensing circuit.
Make sure all ground connections to the control are good . clean all connections to board .. Clean any ground wires to burners. Pull pilot assembly and clean all metal surfaces that the pilot flame contacts(there will be metal rods or bars that the flame inpinges upon) . The flame contacting these metal peices is how the flame signal gets to ground and back to the control.
Blow out pilot tube with compressed air or something similar to clear out any blockages that may be reducing pilot flame size .
Still have the same problem after cleaning all this stuff????????????????? REPLACE whatever device generates the spark.
Edited by ACtechGUY, 05 March 2011 - 09:51 AM.
Posted 05 March 2011 - 12:41 PM
Posted 06 March 2011 - 05:33 AM
Posted 06 March 2011 - 10:13 AM
This is the spark module you want to get http://www.forwardth...ell/63_9411.pdf
once installed , It will tell you if you have another problem, like bad ground , shorted anything, ect. It is a awesome product.
It is never a bad idea to check a heat exchanger for cracks and rust. The best way to do this is to take the top off the unit.
Posted 06 March 2011 - 04:21 PM
Edited by Nicky, 06 March 2011 - 11:03 PM.
Posted 06 March 2011 - 07:11 PM
Posted 06 March 2011 - 11:15 PM
Posted 06 March 2011 - 11:25 PM
But you said it yourself , it was sparking and igniting... so why get a new spark cable??
Just read the instructions that come with the module. Look for the newest version that comes in a pretty black box with a photo of the module on it. that version comes with a trouble code sticker, connectors, and better instructions on what terminals go where.
Posted 06 March 2011 - 11:29 PM
Posted 08 March 2011 - 12:23 AM
Edited by Nicky, 08 March 2011 - 12:25 AM.
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