TROUBLESHOOTING TABLE (cont)
TEST OR INSPECTION
ENGINE COOLANT HEATER (cont)
30. HEATER DOES NOT START WITH RUN-OFF-START SWITCH
START POSITION. HEATER MOTOR DOES NOT RUN.
Push PRESS-TO-TEST switch on engine coolant heater con-
trol box to test for electrical power. If light does not light,
check for loose electrical connections at control box and
Tighten loose connections.
Check to see if battery connections are tight.
Notify unit maintenance to tighten loose battery connections.
31. COOLANT HEATER OVERHEATS.
Step 1. Check to see if one or both coolant shutoff valves are
Open coolant shutoff valves (page 2-235).
32. COOLANT HEATER OUTPUT IS TOO LOW.
Step 1. Check to see if the HI-LO switch is in LO position.
Move HI-LO switch to HI position (page 2-236).
33. BATTERIES OVERHEAT.
Air temperature is too warm to need engine coolant heater.
Turn off engine coolant heater (page 2-235). You do not
need to use heater if temperature is above -25°F (-32°C).
Engine is running at same time as engine coolant heater.
Turn off engine coolant heater (page 2-237) as soon as
Batteries are overcharged and boiling out liquid.
Record faults on form DA 2404 and notify unit