20
P/N 974-
4135
Rev: 2.51
IX800 Operation & Service Manual
Burner blower starts, spark, flame goes out after four seconds
Symptom
Possible Problems
Error Light
Three error flashes on ignition controller.
Flame turns off after 4 sec TFI.
Bent flame rod.
3
Wet flame rod.
3
Cracked flame rod ceramic insulator.
3
Burner not grounded.
3
Ignition controller failure.
3
Malfunctioning main blower
Symptom
Possible Problems
Error Light
Error code on the VFD. Contact
manufacturer.
VFD failure.
Burner starts but main blower motor can’t
accelerate to full RPM (hamming noise
& excessive amperage draw). VFD trips
during blower motor acceleration. Heater
starts but shuts off when main blower
motor starts.
Low voltage (long extension cord,
low cord gauge or too many items on
circuit).
-
Poor quality power (such as from a
generator).
-
Improper voltage.
-
Incorrect motor RPM.
Incorrect VFD frequency setting.
-
Main blower motor won’t turn (VFD
works) or noisy. VFD trips. Main blower
motor won’t turn if manual pushbutton is
pushed in.
Main blower motor failure.
-
Motor starts, but little or no air flow.
Broken belt.
-
Motor connected in reverse.
-
Main blower motor can’t accelerate to full
RPM. VFD trips off during blower motor
acceleration. Vibration in main blower.
Contact manufacturer.
Belt too tight.
-
Bearings seized.
-
Main blower motor never starts. Three
error flashes on ignition controller.
Preheat relay (2) failure.
3
Excessive noise or vibration.
Damaged or unbalanced main blower
impeller.
-
When cooling, main blower works in
short burst cycles.
Side RTD or RTD controller-related
failure.*
-
Squeak noise during main blower motor
start up. Noisy main blower operation.
Vibrations in main blower.
Loose belt.
-