23
Pilot Outage Chart
Problem
Possible causes
Solutions
1.
Standard crown.
Install optional all weather cap.
903656
2. Goes out only when it snows
Install optional extension kit
901937
3.
Install all weather cap.
903656
4.
Install optional HSI conversion kit.
903428
Environmental (external to furnace)
Install optional extension kit to take
both inlet and exhaust above roof
peak.
Roof Jack termination too low, covering
inlet
All the above have been tried with no
resolution.
Goes out only when its windy or
Barometric pressure drops
suddenly
Goes out only in zero or sub-zero
weather
Conditions are such that pilot will
not stay lit.
Roof jack termination too close to roof line,
causing downdraft.
Ice forms around air inlet and blocks off
combustion air
Problem
Possible causes
Solutions
1. No pilot Flame
No inlet gas pressure.
Check sources.
Plugged pilot orifices.
Clean or replace orifices.
2.
Thermocouple burned through.
Replace thermocouple if defective.
Millivolts OK-Replace gas valve.
3.
Restricted air inlet or exhaust pipe.
Clean out any debris.
No baffle prior to April, 1999.
Install baffle kit.
903722
4.
Gas valve not staging.
Replace gas valve.
5.
Gas valve closing improperly
Replace valve
Pilot dirty or needs adjustment
Adjust or clean pilot
Clean and or adjust pilot. Check inlet
gas pressure.
Pilot lights OK, goes out when
main valve comes on or shortly
thereafter
Gas valve not staging or too high inlet gas
pressure.
Replace valve, lower gas pressure at
regulator or house.
Pilot lights with button held, but
goes out when released.
Pilot not contacting 3/8” to 1/2” top of
thermocouple.
Mechanical (Internal to Furnace)
Pilot goes out when main valve
comes on or shortly after, but
only on cold start-up- first cycle
only.
Pilot lights OK, goes out when
gas valve closes (pulled out)
Check for proper millivolts - see
thermocouple section for procedure.