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The PH20-30A has built in diagnostic capabilities. When the microprocessor-based
control detects a fault, it displays an error code by flashing the red LED. To clear an
error code, turn off the main switch. (Except for low voltage)
Table 3 Error Codes
Number
of
Flashes
Problem Remedy
1
*
Combustion pressure fault.
Pressure switch did not
close during TFI
Check voltage at heater while running.
Check combustion pressure tube between burner
head and pressure switch.
Check combustion air inlet for blockages.
Check motor
2 Flame is detected in the
combustion chamber at a
time it should not be.
Check solenoid valve for open condition.
3 Burner has failed to ignite
after TFI sequence
Check fuel supply.
* The blower will run for approximately 5 minutes before this code is flashed. During this
time, the unit will not heat.