HUPP MF510B, MF510C, MF60A-24V, MF60B-24V - CONTINUED
TEST OR INSPECTION
2. HEATER DOES NOT START BELOW 40°F (4°C) -CONTINUED
Check for defective heating elements in fuel regulaIor valve (1) and reservoir (2) as fol-
Disconnect all three heating element leads (3) from terminal 5 on terminal
Measure resistance of each heating element by placing red multimeter probe
on heating element lead (3) and black probe on ground.
1. If any multimeter reading is less than 10 ohms or greater than 20 ohms,
replace fuel regulator valve (page 3-47).
2. If all multimeter readings are within limits, replace heater.
Step 1. Check for defective blower motor (step 12, malfunction 1).
Step 2. Check for defective flame detector switch (step 13, malfunction 1).
Step 3. Check for defective burner plate or combustion chamber (step 14, malfunction 1).
4. HEATER OUTPUT TOO LOW
Step 1. Remove guard (page 2-32).
Step 2. Clean, and inspect fuel regulator valve (page 3-47).