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Troubleshooting
Troubleshoot heater by first conducting a Basic Inspection, then proceed to the appropriate section below
for further direction.
Basic Inspection
Power
•
Check that all the electrical connections are intact and not damaged or corroded.
•
Check the fuse.
•
Ensure voltage going to the heater is 10.5 -16.0 volts while the heater is switched on.
Fuel
•
Ensure there is ample clean fuel supply
•
Check for restrictions or loose connection in fuel system
•
Visual inspection to see fuel in the clear plastic fuel lines (Should see bubbles)
Combustion Air
•
Check for restrictions in combustion air intake or exhaust tubes
Ducting
•
Visual inspection of hot air ducting to ensure there are no blockages.
Self Diagnostics
The PHP-20A has an automatic built in error code detection system. When the heater detects a fault, it
should display a two-digit error code on the Operating Switch. Refer to the Fault Codes section of this
manual for further direction.
No Error Codes Detected
If the heater does not attempt start and there is not an error code on the operating switch, follow these
procedures in order shown:
1) Ensure that the ambient temperature does not exceed the settings on the operating switch.
2) Reconfirm that you have checked the power supply to the heater as noted in Basic Inspection.
3) Reboot the ECU by removing the power to the heater for 5 minutes or more. Remove the fuse at the
battery and then reinstall the fuse and turn the heater on to test.
4) Install and test the heater with a new control switch.
5) Install a new electronic control unit into the heater and test.
Combustion Issues
If the heater proceeds through a start up cycle but fails to establish a flame, runs intermittently or exhibits
excessive smoking, there is most likely a combustion related problem. In these situations, the operating
switch should display either error code 9 or 10. Combustion issues are caused by a deficiency of one or more
of these required components; Fuel, Combustion Air, Source of Ignition or Mixing. Review each of these and
rectify as required.
