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Mr. Heater | Gas-Fired Low-Intensity Infrared Heater Operating Instructions and Owner’s Manual
Section 7 TROUBLESHOOTING
General
This troubleshooting quide has been designed to assist you in locating and correcting minor problems that may occur with the MHT tube heater.
BLOWER DOES NOT COME ON
Possible Cause Try This….
Power cord is not plugged in. Plug power cord into a grounded three prong Outlet.
Thermostat setting is too low. Increase thermostat temperature setting.
DSI module needs to be reset. Unplug heater power cord from the electrical Outlet: wait for a
minimum of ve seconds. Plug heater cord back into outlet.
No power at electrical outlet. Replace fuse or reset circuit breaker
Faulty blower motor Replace blower motor.
IGNITER DOES NOT SPARK
Possible Cause
DSI module needs to be reset.
Faulty igniter or ignition wire.
Air switch does not operate.
Igniter spark gap incorrect.
Try This…..
Unplug heater power cord from the electrical outlet: wait for a
minimum of ve seconds. Plug heater cord back into outlet.
Unplug heater power cord from the electrical outlet; check igniter and
ignition wire for damage. If damaged, replace igniter and/or ignition
cable.
Check ue/air supply duct for obstructions; remove obstructions as
required. Check for loose/leaky air hoses to the air switch; repair/
replace/tighten hoses as required. Check for 24V across the secondary
terminals 4 and 5 (red and yellow wires) of the transformer. IF NO:
Check for 120V across the primary terminals 1 and 3 (black and white
wires) of the transformer. If 120V is present, replace transformer. If 120V
is not present, check wiring between power cord, blower motor and
transformer. IF YES: Connect a jumper wire across air switch terminals;
if jumper wire allows blower to operate, replace pressure switch (see
replacement parts list for part number that applies to your unit rating).
Reset spark gap to 1/8’ (0.125”).