No Gas Rheem classic 90 RGRJ


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Old 01-25-11, 07:18 AM
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No Gas Rheem classic 90 RGRJ

Heater: Rheem Classic 90 Model RGRJ In service since 7/02
Problem:
Thermostat calls for heat
Steady Green Light
Inducer motor starts and runs
lighter comes on and glows
no gas, no flame Voltage across gas valve is zero
no yellow light
lighter goes out
inducer motor quits
blower is off
no heat
Troubleshooting activities:
Resetting (power off then on) will bring on the flame 99% of the time
checked for exhaust clogs, none found
no evidence of water at inducer fan housing barb
have NOT checked exhaust T at inducer for obstructions
cleaned the l shaped rod thingy mounted on the burner with scotch bright
Continuity across wires attached to switch? on burner chamber
Continuity across wires a switch mounted to burner frame
Question:
Will pressure switch inhibit gas even though inducer and lighter are on.

Thanks
 
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Old 01-25-11, 08:24 AM
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Originally Posted by traffic
Will pressure switch inhibit gas even though inducer and lighter are on.
Yes........................................

Mike NJ
 
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Old 01-26-11, 04:29 AM
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not the pressure switches

pressure switches seem to be OK. This furnace like many other appliances in my experience are not designed to be fixed. Poor, Poor diagnostic engineering. Shame on you Rheem!!!!
 
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Old 01-26-11, 11:46 AM
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Furnaces are designed to be repaired. You need to have the requisite skills to diagnose the problems.


In this case, generally speaking once the pressure switch closes, the next step in the sequence of ignition is for the hot surface ignitor to heat up, then the gas valve should switch on the main burner gas and the gas should light off the HSI.

The HSI is heating up but power to operate the electric gas valve is not being switched on.


Now, it's remotely possible that the pressure switch is opening at just the right instant to prevent the electric gas valve from turning on, although that's unlikely. You can check that though.

If the pressure switch is staying closed, you have a bad ignition control module. You have all the inputs needed for the ignition control to turn on the gas valve, but it's not doing what it should.

Replace the ignition control.
 
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Old 01-26-11, 11:52 AM
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Before you turn power off to reset, the module should throw a code. Look in your manual. What is the code the module is flashing?

Mike NJ
 
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Old 01-26-11, 08:32 PM
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Diagnostics

Thanks for the tip on the code on the integrated control module. The unit is engineered so well you have to remove the blower door to see the code, but the power is shut off when you remove the door and there goes the code. A beautiful example of poor engineering, a piece of cake for those who have the "prerequisite skills".
 
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Old 01-26-11, 08:48 PM
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The power should not shut down when you open the panal. Only will not let the blower run so it will not ignite. Hold the button with your finger then until you get the code. You need to think outside the box. We must out smart those engineers!!!!

Ya know maybe the power does cut off...........

Mike NJ
 

Last edited by lawrosa; 01-26-11 at 09:05 PM.
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Old 01-26-11, 09:23 PM
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Well traffic,

I can think of several ways of observing the code.


I think you are best off having a qualified repairman inspect your equipment.
 
 

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