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 / HST 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.
No power at electrical outlet.
Faulty blower motor
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 minimum of five seconds. Plug heater cord back into outlet.
Replace fuse or reset circuit breaker
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 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”).
Enerco Group, Inc., | 20 | Operating Instructions and Owner’s Manual |