LizardKing
RVF Newbee
- Joined
- Oct 1, 2023
- Messages
- 1
Suburban SF-30FQ furnace, about 6 years old.
Trouble started when it wouldn’t ignite. The fan would turn on, then I heard the igniter clicking and no flame. The flame would start, I would feel heat in the exhaust, then the flame would go out. Igniter would start again, flame would start, then go out. This happened 3 times, then would turn off.
Troubleshooting Steps:
Replaced the regulator.
Checked for cob webs in the regulator.
Tried two different propane tanks.
Removed the furnace and started bench testing.
Disconnected and reconnected each wire in the furnace, board, relays, etc.
Took apart the burner and confirmed 1/8’ gap between the igniter/flame sensor, and the burner.
Confirmed burner assembly was not rusted or dirty
Checked and cleaned line from the gas valve to the burner and orifice.
Used mild emory cloth to clean the igniter/flame sensor.
Connected propane tank with a single working regulator to the furnace.
Connected red wire to positive terminal of a car battery
Connected yellow wire to negative terminal of the car battery.
Connected both blue wires together (Thermostat wires)
Furnace turns on, everything works fine on my bench.
Tried this several times with no problems.
Reinstalled furnace in camper.
Tomorrow I’m going to:
1. Reinstall the furnace in the camper but connect it with an external propane tank with single regulator (that I used on my bench) to eliminate propane pressure problem.
2. Bypass the thermostat and hook the two blue wires together to eliminate the thermostat.
Not sure what else to try, Any suggestions?
Trouble started when it wouldn’t ignite. The fan would turn on, then I heard the igniter clicking and no flame. The flame would start, I would feel heat in the exhaust, then the flame would go out. Igniter would start again, flame would start, then go out. This happened 3 times, then would turn off.
Troubleshooting Steps:
Replaced the regulator.
Checked for cob webs in the regulator.
Tried two different propane tanks.
Removed the furnace and started bench testing.
Disconnected and reconnected each wire in the furnace, board, relays, etc.
Took apart the burner and confirmed 1/8’ gap between the igniter/flame sensor, and the burner.
Confirmed burner assembly was not rusted or dirty
Checked and cleaned line from the gas valve to the burner and orifice.
Used mild emory cloth to clean the igniter/flame sensor.
Connected propane tank with a single working regulator to the furnace.
Connected red wire to positive terminal of a car battery
Connected yellow wire to negative terminal of the car battery.
Connected both blue wires together (Thermostat wires)
Furnace turns on, everything works fine on my bench.
Tried this several times with no problems.
Reinstalled furnace in camper.
Tomorrow I’m going to:
1. Reinstall the furnace in the camper but connect it with an external propane tank with single regulator (that I used on my bench) to eliminate propane pressure problem.
2. Bypass the thermostat and hook the two blue wires together to eliminate the thermostat.
Not sure what else to try, Any suggestions?
Last edited by a moderator:
