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3-90-30007474
Vermont Castings • Intrepid DV-IFT Owner’s Manual_R20 • 11/21
M. Troubleshooting
- (Continued)
Symptom
Possible Cause
Corrective Action
Pilot sparks but does not light, after 90
sec, 3 Red/1 Green Lockout
No gas supply.
Verify incoming gas line ball valve is ‘Open’. Verify inlet
pressure is within requirement for gas type used. Contact
gas supplier.
ECM has poor ground.
Verify wiring, check valve harness black wire is securely
grounded to metal chassis.
Gas valve defective.
Check pilot valve solenoid kick and hold voltages during
ignition cycle. Kick V should be >1 V, hold V minimum
0.26 V. If voltages are OK, replace gas valve.
Pilot lights but main burner does not
light. Pilot continues to spark for 90 sec
then goes into 3 Red/1 Green Lockout.
No flame detected. Flame
rectification issue.
Check if white sense lead is securely connected to
‘S’ terminal of IFT-
ECM. Check resistance of sense
lead between sense rod tip and connector to IFT-ECM,
should be less than 1 ohm - if not, replace pilot assembly.
Check system ground, ensure black valve harness wire
is securely attached to metal chassis. Check wiring for
damage. With system OFF, check resistance between
tip of sense rod and pilot hood, should be resistance (>1
M-ohm).
No flame detected or sense
rod contamination.
With glass assembly installed, verify pilot flame is
engulfing flame sense rod on pilot assembly. Verify inlet
gas pressure is correct for gas type. Polish flame sense
rod with fine steel wool to remove any contaminants that
may have accumulated.
Pilot lights and rectifies, but main burner
does not light.
Main valve solenoid.
Check if green wire in valve harness is connected to
green main valve solenoid. Check main valve solenoid
resistance, nominal is 60 ohms. If open or shorted, replace
valve. Verify valve inlet pressure is correct for gas type.
Pilot and main do not light, ECM goes
into 5 Red/1 Green Lockout.
Power Vent (PV) Failure.
Power Vent blower defective - check wiring to
IFT-
ACM,
check if blower is working. Check if PV pressure switch
is connected to brown and black wire in 6-pin valve wire
harness. Check if pressure switch is closed (shorted)
when PV blower is running. Refer to PV troubleshooting
instructions.
Appliance lights and runs for a few
minutes then shuts down and/or
appliance cycle ON and OFF with less
than 90 sec of ON time.
Shorted or loose connection
in flame detection circuit.
Check if white sense lead is securely connected to
‘S’ terminal of IFT-
ECM. Check resistance of sense
lead between sense rod tip and connector to IFT-ECM,
should be less than 1 ohm - if not, replace pilot assembly.
Check system ground, ensure black valve harness wire
is securely attached to metal chassis. Check wiring for
damage. With system OFF, check resistance between
tip of sense rod and pilot hood, should be resistance (>1
M-ohm).
Poor flame rectification or
contaminated sense rod.
With glass assembly installed, verify pilot flame is
engulfing flame sense rod on pilot assembly. Verify inlet
gas pressure is correct for gas type. Polish flame sense
rod with fine steel wool to remove any contaminants that
may have accumulated. Verify no soot deposits are in
sense rod to pilot hood gap.
Logs are set up wrong.
Remove and re-install logs per the log placement
instructions.
Damaged pilot assembly.
Verify the pilot assembly ceramic insulator around the
flame sensing rod is not cracked, damaged or loose.
Check resistance between tip of sense rod and IFT-ECM
connector, should be less than 1 ohm. Replace pilot
assembly if damage is detected.
