TROUBLESHOOTING
HUPP MF510B, MF510C, MF60A-24V, MF60B-24V
MALFUNCTION
TEST OR INSPECTION
CORRECTIVE ACTION
1. HEATER DOES NOT START
NOTE
Igniter and flame detector switch test good or have been replaced.
Multlmeter must be set for dc voltage measurements before performing steps
2 and 3. Damage to multlmeter may result.
Step 1.
Step 2.
Step 3.
Set multimeter for dc voltage measurements.
Remove guard (page 2-32).
With an ohmmeter, check the resistance of the ignitor to the ground. If OPEN, replace
igniter; if igniter resistance is 4 ohms or more, igniter function is OK. Set multimeter for
DC voltage measurements. Turn heater to START; measure voltage from igniter to
ground. If voltage is 20-24VDC, the voltage regulator is OK. If reading is outside accept-
able range, replace voltage regulator.
Step 4.
Check for defective igniter relay/power control (1) by starting heater (page 2-60) and
placing red multimeter probe on output terminal E (2) and black probe on ground.
a. If multimeter reading on MF510B heater is Iess than 19 volts or more than 26
volts, replace igniter relay (page 3-41).
b. If multimeter readings on MF510C, MF60A-24V, and MF60B-24V heaters
are less than 17 volts or more than 18 volts, replace power control (page
3-43).
3-3
TM 9-2540-205-24&P
C A U T I O N
