Troubleshooting Guide - Master MH-375T-GFA-A User's Manual & Operating Instructions

Locating Your Serial Number:
Your serial number can be found on a white label on the right side cover of your heater. It will begin with
the letters "G" followed by 9 digits. For Example: G181200001. Have your Serial Number ready before calling
customer service at 800-641-6996.
Problem
Fan does not turn when
electricity is connected.
Heater will not fire (ignite).
Heater stops running
by itself.
© 2018 Pinnacle Climate Technologies, Inc.
NEVER LEAVE HEATER UNATTENDED WHILE BURNING,
CONNECTED TO A POWER SOURCE, OR WHILE
CONNECTED TO A FUEL SOURCE

TROUBLESHOOTING GUIDE

Possible Cause(s)
1. No electric power to heater.
2. Blades of fan in contact with
heater housing.
3. Fan blades bent.
4. Fan motor defective.
1. No spark at module.
2. Incorrect spark gap.
3. Corroded electrode.
1. Temperature inside heater
is too high, causing thermal
switch to shut down operation.
2. Damaged control valve.
3. Dust or Debris accumulated
in heater.
1. Check current at outlet. If
voltage is correct, inspect
extension and power cords for
cuts, frays or breaks
2. Check housing for damage. Be
sure there are no dents in the
housing obstructing the fan.
3. Straighten all fan blades.
4. Replace motor assembly.
1. Inspect module wire. Re-attach
or tighten if loose. Inspect
spark module and replace if
necessary. Inspect all other
electrical components.
2. Set plug gap to 0.16" (4 mm).
3. Replace spark plug
(multi-bracket assembly).
1. If the heater input or output
is restricted, the inside
temperature can become too
hot. Keep the areas in front
and behind heater clear of
obstructions.
2. Replace control valve.
3. Clean inside of heater.
11 Propane Forced Air Heater User's Manual
Solution