TM 9-2540-205-24&P
TROUBLESHOOTING-CONTINUED
ESPAR V7S - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
3. HEATER OUTPUT TOO LOW-CONTINUED
Step 5. Check for adequate fuel supply.
vehicle technical manuals).
Troubleshoot vehicle fuel system (refer to applicable
Step 6. Replace circulating pump (page 3-174).
Step 7. Replace fuel pump (page 3-176).
If heater output is still too low, replace heater.
4. HEATER OVERHEATED
NOTE
In order to restart the heater after overheating has occurred, the overheat reset but-
ton on the switchbox must be depressed.
Step 1.
Step 2.
Step 3.
Step 4.
Check for blocked air inlet, hot air outlet, or exhaust pipe.
Clear all passages to and from heater (refer to applicable vehicle technical
manuals).
Check for defective temperature sensor (step 3, malfunction 3, page 3-140).
Check switchbox for damaged temperature selector switch (refer to applicable vehicle
technical manuals).
Replace overheat switch (page 3-148).
If heater still overheats, replace heater.
5. HEATER DOES NOT SWITCH OFF AFTER PURGE CYCLE
Step 1. Replace thermostatic switch (page 3-142).
Step 2. Replace heat regulator (page 3-179).
If heater still does not switch off after purge cycle, replace heater.
6. HEATER OPERATES ON HALF-RATED OUTPUT AFTER 3 MINUTES
Step 1.
Step 2.
Check for defective temperature sensor (step 3, malfunction 3, page 3-140).
Check switchbox for damaged temperature selector switch (refer to applicable vehicle —
technical manuals).
If heater still operates on half rated output after 3 minutes, replace heater.
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