HUPP MF510B, MF510C, MF60A-24V, MF60B-24V - CONTINUED
TEST OR INSPECTION
If multimeter reading exceeded the limits, also replace the igniter (page 2-35).
1. HEATER DOES NOT START-CONTINUED
Check for defective valve relay (3) by connecting a jumper wire between terminals 1 and
7 of terminal strip (4) and placing red multimeter probe on terminal 7 of terminal strip (4)
and black probe on ground.
If there is no voltage present on terminal 7, replace valve relay (page 3-32).
Set multimeter for resistance measurements.
Check for defective shut-off solenoid (5) by disconnecting solenoid lead 7 (7) from termi-
nal 7 of terminal strip(4) and placing red muitimeter probe on lead 7 (7) and black probe
If multimeter reading is less than 80 ohms or more than 100 ohms, replace
fuel regulator valve (page 3-47).
Remove flame detector switch, and check for obvious signs of damage (page 2-33).
Replace if necessary (page 2-33).
Check for defective overheat switch (6) by placing red multimeter probe on terminal 1 and
black probe on terminal 7 of terminal strip (4).
If multimeter reading is one ohm or more, replace overheat switch (page