22
P/N 974-
4135
Rev: 2.51
IX800 Operation & Service Manual
Inlet pressure drops under 7”. Valve train
pressure below nominal value. Heater ignites
but shuts off after awhile. Three error flashes
on ignition controller.
Propane tank too small to vaporize
fast enough or tank freezes.
3
Low inlet pressure.
3
Burner cycles on and off frequently.
Ducts too long, too small, or
obstructed.
-
Low power output. Excessive CO from
exhaust.
Changeover valve set to propane
when connected to natural gas.
-
Noise and/or vibration in burner blower. Poor
combustion. Burner turns off. One error flash
on ignition controller.
Damaged or unbalanced burner
blower impeller.
1
Orange light always off.
Preheat relay (1) failure.
-
Orange light burned out.
-
Orange light always on.
Preheat relay (1) failure.
-
Heater runs very hot.
Both output limit switch and side
RTD or RTD controller fail to
operate.*
Y
Heater does not turn off when thermostat
turned to minimum. Two error flashes on the
ignition controller.
Solenoid valve leaks.
2
Solenoid valve installed
backwards.
2
Solenoid valve stuck open.
2
Heater starts normally. Doesn’t cycle with long
ducts. Burner turns off and stays off. No error
lights. Green light on. Output limit switchneeds
reseting.
Side RTD or RTD controller-
related failure.*
-
Note: *Consult manufacturer for error codes.
