7BASIC TROUBLESHOOTING
W
EBASTO
S
CHOLASTIC
S
ERIES
7-4
3. Manual test running of heater
- Turn the WATER PUMP switch “ON”
- Turn the MOTOR switch “ON”
- Push and hold the FUEL SOLENOID VALVE button “ON” (starts fuel flow to combustion chamber)
- Push and hold the IGNITION SPARK COIL button “ON” (starts electrodes sparking) until combustion has
taken place.
Test Results:
- LED lights and combustion achieved
- operation normal
- Combustion achieved but no LED light
- check flame detector
- Combustion not achieved and no LED light
- check fuel nozzle
- check fuel pressure
- check for blocked fuel lines (dirt or ice)
- check ignition electrodes for damage and set gap
- Heater should now be in heating mode and will continue to run until you release the fuel solenoid valve
button which stops fuel flow and extinguishes the flame immediately.
NOTE:
Hold IGNITION SPARK COIL button ON until FLAME DETECTOR LED Lights or combustion is heard, then
release; in any case do not hold button on for more than 15 seconds or damage to the coil may result.
- Allow the heater to continue running for approximately 30 seconds (cool down) after which, turn the
WATER PUMP switch and the MOTOR switch “OFF”.
- Once the manual test run has been successfully completed, set the heater switch/ timer to “OFF”, remove the
tester and reconnect the control unit. Once done, set the switch/timer to “ON”; if heater or a heater
component does not respond, the control unit is defective; replace the control unit and retest the heater.
NOTE:
If flame does not stop when the FUEL SOLENOID VALVE button is released, turn MOTOR switch OFF to stop
heater. Check and repair fuel solenoid valve accordingly.
NOTE:
Since the heater operates in the 68 °C (155 °F) to 75 °C (167 °F) On to Off/ Off to On range, and the vehicle engine
may be hot [e.g. coolant above 75 °C (167 °F)], the heater will not start until the coolant temperature is below
68 °C (155 °F). THIS IS NORMAL and does not indicate a problem.
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