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Guardian PowerVent Training Manual
pilot flame. You will have 120V at the blue#6 main valve wire. If you have 120V and there is
gas vacuum and a pilot flame, then you must have main burner flame. If not replace the control
valve.
The control mechanism is a replaceable part. However, proper troubleshooting must be used to
distinguish between the board and the gas valve mechanisms. The gas valve control board logic
is proprietary to Rheem. Three times (cycles) and the valve locks out on the respective code. In
some instances, the control will reset by cycling the power to the control valve.
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Blower motor thermal safety switch (vent over temperature) is set to 180°F with automatic reset.
It is wired in series after the vacuum safety, and before the control module. If the sensor does not
cool, there will be no power to the blue #8 terminal on the control valve.
Without power at the blue #8, the control module will not forward power to the pilot side of the
gas valve. After cycling, there is no flame rectification and will force a lockout (1/1 flash –
Ignition Failure). Verify continuity through the thermal safety switch. IF no continuity, then
switch is open. Cool the switch to reset.
Figure 9 – Vent Over Temperature Safety Switch
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Checking the ignitor is accomplished by first listening for the 'sparking' sound. It sounds like a
rapid ticking. Listen for the spark ignitor. If you do not hear spark, verify 120V at the blue #8
wire, and then blue #6 pilot wire on the control. If you have blower motor and power, but do not
hear the sparking sound, then replace the control module.
1. If you hear spark, then reset heater. Using insulated pliers, remove the orange cable from
the control.
2. When you hear spark again, slowly move the orange wire terminal back to the control
and verify spark with at least 1/8 inch gap.
3. If there is no spark, then replace the control.
4. If there is spark, turn heater off and verify continuity of orange wire.
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1. Remove the on/off switch cover panel.
2. Disconnect the blue wire to the vacuum safety switch.
3. Disconnect the Molex plug.
4. Measure continuity along the blue wire from the spade
terminal to the Molex plug. The vent over-temperature
switch is a normally closed switch. You should have
continuity. The switch is good.
5. If you do not have continuity, then cool the over temp
switch. You can accelerate this process with a cold rag
placed on the switch. Once the switch cools to less than
180°F, you will get continuity. If not, replace the switch.
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SVC900; Rev 1
Page 24
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Troubleshooting
