21
IX800 Operation & Service Manual
P/N 974-
4135
Rev: 2.51
Other problems during operation
Symptom
Possible Problems
Error
Light
Main blower fan takes a long time to start.
Possible exchanger damage.
Top RTD or RTD controller-related
failure.*
-
Burner turns off shortly after it’s turned on.
Burner turns off frequently.
Side fan/limit switch failure.
-
Control box cooling fan is always running.
Average temperature in control box low.
Control box cooling fan limit switch
failure.
-
Control box cooling fan never starts. If in a
warm environment, VFD may overheat and
fail.
Control box cooling fan limit switch
failure.
-
Control box cooling fan burned
out.
-
Excessive yellow flame. Burner rumbling.
Heater connected to liquid
propane supply.
-
Manifold pressure set too high.
-
Changeover valve set to natural
gas when connected to propane.
-
Main blower fan starts then shortly after,
supply panel breaker trips.
L1 3 phase missing.
-
L1 fuse blown.
-
L1 contact on power selector
switch failure.
-
Green light on. Orange light and heater turn
on and off sporadically.
Preheat relay (2) failure.
-
Heater does not stop when the stop button is
pressed.
Start switch failure.
-
Stop switch failure.
-
Heater operates normally. Average
temperature in control box lower. VFD
susceptible to fail while operating at a low
temperature.
Preheat limit switch failure.
-
Heater operates normally. Green power light
off.
Green light burned out.
-
Heater operates normally. No preheating.
Preheat limit switch failure.
-
Heater shuts off or heater ignites but shuts off
after awhile. Three error flashes on ignition
controller.
Gas hose too small, too long, or
blocked.
3
Heater starts immediately in cold weather.
Preheat relay (2) failure.
-
Heater does not turn off when the thermostat
is turned to minimum. No error light on ignition
controller.
Thermostat failure.
-
