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Other problems during operation
Symptom
Main blower fan takes a long time to start.
Possible exchanger damage.
Burner turns off shortly after it's turned on.
Burner turns off frequently.
Control box cooling fan is always running.
Average temperature in control box low.
Control box cooling fan never starts. If in a
warm environment, VFD may overheat and
fail.
Excessive yellow flame. Burner rumbling.
Main blower fan starts then shortly after,
supply panel breaker trips.
Green light on. Orange light and heater turn
on and off sporadically.
Heater does not stop when the stop button is
pressed.
Heater operates normally. Average
temperature in control box lower. VFD
susceptible to fail while operating at a low
temperature.
Heater operates normally. Green power light
off.
Heater operates normally. No preheating.
Heater shuts off or heater ignites but shuts off
after awhile. Three error flashes on ignition
controller.
Heater starts immediately in cold weather.
Heater does not turn off when the thermostat
is turned to minimum. No error light on ignition
controller.
P/N
974-4135
Rev: 2.51
IX800 Operation & Service Manual
Possible Problems
Top RTD or RTD controller-related
failure.*
Side fan/limit switch failure.
Control box cooling fan limit switch
failure.
Control box cooling fan limit switch
failure.
Control box cooling fan burned
out.
Heater connected to liquid
propane supply.
Manifold pressure set too high.
Changeover valve set to natural
gas when connected to propane.
L1 3 phase missing.
L1 fuse blown.
L1 contact on power selector
switch failure.
Preheat relay (2) failure.
Start switch failure.
Stop switch failure.
Preheat limit switch failure.
Green light burned out.
Preheat limit switch failure.
Gas hose too small, too long, or
blocked.
Preheat relay (2) failure.
Thermostat failure.
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