TROUBLESHOOTING-CONTINUED
HUPP MF510B, MF510C, MF60A-24V, MF60B-24V - CONTINUED
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
4. HEATER OUTPUT TOO LOW - CONTINUED
Step 5. Check fuel regulator valve for adequate fuel delivery (page 3-55).
Adjust if necessary (page 3-53).
Step 6. Test heater (page 3-193).
a. If heater output is still too low, replace heater.
b. If heater output is normal, install guard (page 2-32).
5. SURGING COMBUSTION, OR HEATER OVERHEATS AND STOPS BURNING
Step 1. Check for defective overheat switch (step 8, malfunction 1).
Step 2. Check fuel regulator valve for proper fuel delivery (page 3-55).
Adjust if necessary (page 3-53).
Step 3. Clean fuel nozzle (page 2-39).
Step 4. Check for defective valve relay (step 4, malfunction 1).
Step 5. Test heater (page 3-193).
If heater still does not run properly, replace heater.
6. HEATER DOES NOT SHUT OFF
NOTE
Flame detector switch contacts test good or switch has been replaced.
Check flame detector switch for obvious signs of damage (step 7, malfunction 1).
3-10
TM 9-2540-205-24&P
