Table 4-2. Unit Troubleshooting - CONT.
TEST OR INSPECTION
BURNER MOTOR DOES NOT OPERATE.
Remove rings, bracelets, wristwatches, and neck chains before working on any vehicle. Jewelry can
catch on equipment and cause injury, or may short across an electrical circuit and cause severe burns or
Step 1. Remove two screws and cover and check for 120 Vac at positive terminal using multimeter.
If 120 Vac is present, replace burner motor (page 4-247).
Burner assembly must be completely cooled before performing Step 2.
Step 2. Remove screw and cover. Loosen two screws, and remove subbase. Loosen three screws and subbase
plate. Using multimeter, check for 12,000 to 18,000 ohms resistance between white wire and each red wire of
coil. Measured resistance should be within 1,000 ohms on each wire.
If resistance is not within 1,000 ohms on each wire, or resistance is high or low, replace burner coil
If resistance is good, replace burner controller (page 4-275).