Rheem Guardian PowerVent Training Manual page 20

Guardian PowerVent Training Manual
ignitor. The control will lockout if it failed to ignite gas after three (3) ignition attempts. Here is
how it works:
1. Verify control valve is ON.
2. Verify there is gas to the valve.
3. Verify minimum gas pressure.
4. Check for 120V voltage to the pilot valve (yellow wire) connection at the gas valve. If
voltage is present, replace control valve.
5. If voltage is not present then check for 120V at terminal #7 (yellow wire) and at #5
(yellow wire). If power at #5, but not at #7, then replace control.
6. If power at #7, check yellow wire and Molex connector to valve. Listen for the spark
ignitor. If you do not hear spark, verify 120V at the red #4 wire on the control. Replace
the control module.
7. If you hear spark, using insulated pliers, remove the orange cable from the control and
reset heater. 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. If there is no spark, replace the
control.
8. If there is spark, but not at the ignitor, the check for proper spark gap between electrode
and pilot hood. Replace ignitor.
9. If there is spark, then check for a pilot flame first. If there is no pilot flame, then check
power to the pilot side (yellow wire) of the gas valve.
10. Check for gas and gas pressure.
Two (2) Flash / One (1) Flash – The FV sensor has detected a flammable vapor. There is no
recovery from this fault code. The electronic control module and sensor must be replaced.
Two (2) Flashes / Three (3) Flashes – The FV sensor has malfunctioned is miswired. There is
no recovery from this fault code. The electronic control module and sensor must be replaced.
Three (3) Flashes / One (1) Flash – The vacuum switch has failed to open. The control insures
that the vacuum switch is open before it turns on the blower. If the control cannot force the
switch to open by cycling the blower, it will indicate this failure. The vacuum switch is a safety
device. Vacuum switch is normally open. The control checks to ensure the vacuum switch can
open (safety position) before it starts its sequence. If the switch is closed and cannot be opened,
the code will flash. Vacuum switch is closed and cannot be opened.
1. Turn heater off and remove wires to vacuum switch.
2. Measure continuity thru the switch.
3. If there is continuity, then replace switch.
Three (3) Flashes / Three (3) Flashes - Vacuum switch fails to close. When the blower is
turned on, the control insures it that the vacuum switch is closed before continuing with the
ignition sequence. If it cannot force the switch to close by cycling the blower, it will indicate this
failure. The vacuum switch may also fail or fault during main burner. If this happens, then you
will get a flash code of four. If blower motor is operating at speed and there are no vacuum
restrictions, a closed vacuum switch will allow 120V power to pass between the red (inbound)
wire and the blue (outbound) wire. Blocked venting will be a primary cause of this failure. If
SVC900; Rev 1
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