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