Heat Wagon DF400, Installation And Maintenance Manual

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ADVANCED TROUBLESHOOTING CONTINUED
9. Defective transformer.
Call Tech Service.
Heater ignites, runs less than one minute and the flame/safety control trips.
Causes:
1. Photocell dirty or defective.
2. Flame/safety control defective.
Solutions:
1. Photocell dirty or defective.
If the photocell “eye” is dirty, it may be cleaned with a soft dry cloth. Should a cleaner be necessary, use an alcohol based cleaner that will dry
completely without leaving an oil residue. If the photocell is clean and this symptom continues, remove the photocell for testing. Measure resis-
tance, if zero or infinite-replace photocell.
2. Flame/safety control defective.
The easiest way to test the flame/safety control is to prove the photocell is good or bad using one of the two preceding tests under “1.
Photocell dirty or defective”. If the jumper test will not run the heater or the photocell passes the ohm test, the flame/safety control is defective.
Heater ignites, runs several minutes and shuts down.
Causes:
1. Photocell dirty or defective.
2. Fuel filter dirty.
3. Fuel pump is defective.
Solutions:
1. Photocell dirty or defective.
See “1. Photocell dirty or defective” for instructions on cleaning and testing the photocell.
2. Fuel filter dirty.
See “1. Fuel filter dirty”
3. Fuel pump is defective.
See “6. Fuel pump is defective”
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