Vermont Casting 7PDVS - Manual (Page 18)

DV Power Vent System
18 10003262
Troubleshooting the Power Vent System
Power vent motor
is working?
Does the Pilot
Spark?
Pilot Burner
Lights?
ON/OFF switch or wall thermostat “ON”?
Is there 120V power to the fireplace and power vent?
Are all wiring connections tight? (Turn off Power before checking)
Is there 24V at the power vent circuit
board at the 24VAC Hot Terminal?
YES
Is there 120V Power to the motor?
NO
Is there 24V from the transformer?
Check Wiring
Replace Transformer
Replace Power Vent Circuit Board
Replace
Blower
START
Is there 24V power at terminal
six (24V) at the ignition board?
Is the Pressure
Switch Closed? Is there a blockage in the vent?
Is there water/dirt in the hose from
blower to the pressure switch?
Are hose connections loose?
Is the hose cracked?
Replace
Pressure
Switch
Is the lead to the spark electrode
attached or arcing to ground?
Is the electrode cracked?
Replace Ignition Module
Replace Power
Vent Circuit Board
Replace Ignition Module
Is pilot gas line blocked?
Is pilot orifice blocked?
Are wires to valve loose
or corroded?
Replace Gas Valve
Does pilot flame cover
the flame rod? Does Spark
Stop When
Pilot Lights?
Check Pilot for obstruction
Check Gas Pressure
Adjust Pilot Flame
Is flame rod corroded?
Is pilot hood corroded?
Is flame rod insulator cracked?
Is wire to flame rod damaged?
Replace Ignition Module
Does Main
Burner Light?
Is there 24V power at terminal
1 (MV) during spark cycle?
Are wires to valve
loose or corroded?
Replace Ignition Module
System Runs
Continuously
Until Switched
Off?
Is the correct size of orifice restrictor installed in the power vent?
Does the pilot flame covers the flame rod?
Is the flame rod wire in good condition?
Is there continuity to ground from the pilot burner?
Does pressure switch open during operation?
Is vent partially blocked?
Is there water/dirt in hose to
pressure switch?
Are hose connections loose?
Is the hose cracked?
Does 24V power get interupted at terminal six (24V) at the ignition module?
Replace ignition module
Replace power vent circuit board
Replace
Pressure
Switch
NO
NO
YES
YES
YES
NO
NO
YES NO
YES
NO NO
NO
YES
YES
Is there 24V power at terminal
3 (PV) during spark cycle?
NO
NO YES
NO
NO
NO YES
NO
Is there manifold pressure?
Check
position
of pilot.
Is orifice
blocked?
NO
NO
YES NO
NO
YES
Replace Gas Valve
YES
YES
YES
YES
YES
YES
NO
NO
NO
NO
1. Check if there is power to the unit (fireplace) and to the power vent box.
2. Check if there is gas to the unit (fireplace).
3. The ignition control in the fireplace is equipped with a lockout device which will put the unit into a lockout condition after three attempts to ignite the pilot.
Follow the steps in the chart below to reset the control: Turn the On/Off switch to the off position, or turn the thermostat to the off position.
Wait 10 seconds and then turn to the “on” position.
4. If this is the first time that the unit has been fired, check the wiring of the unit against the wiring diagram before commencing troubleshooting.
SIT 822 Valve with Honeywell Electronic Ignitor and Synetek Power Vent Board
Service must be performed by a qualified installer, service agency or your gas supplier.
BEFORE COMMENCING TO TROUBLE SHOOT THE UNIT:
WARNING: Never jump the pressure switch out of this
system. Property damage, injury or death may result.