Section 7 Troubleshooting - Mr. Heater MHT 45 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
Power cord is not plugged in.
Thermostat setting is too low.
DSI module needs to be reset.
minimum of five seconds. Plug heater cord back into outlet.
No power at electrical outlet.
Faulty 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.
Mr. Heater | Gas-Fired Low-Intensity Infrared Heater
Try This....
Plug power cord into a grounded three prong Outlet.
Increase thermostat temperature setting.
Unplug heater power cord from the electrical Outlet: wait for a
Replace fuse or reset circuit breaker
Replace blower motor.
Try This.....
Unplug heater power cord from the electrical outlet: wait for a
minimum of five 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 flue/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").
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Operating Instructions and Owner's Manual