Mr. Heater MHU 45 Operating Instructions And Owner's Manual page 15

8. Restore electrical power and gas supply. Follow lighting
instructions to light unit. Check operation of unit.
COMBUSTION AIR BLOWER
Under normal operating conditions, the combustion air blower
should be checked and cleaned prior to the heating season with
the power supply disconnected. Use a small brush to clean blower
wheel.
ELECTRICAL
1. Check all wiring for loose connections.
2. Check for correct voltage at unit (unit operating).
3. Check amperage draw.
FLUE AND CHIMNEY
15
Enerco | Compact Unit Heater
Check all vent and vent connector joints for tightness. Ensure that
connections are sealed and that there are no blockages.
FAILURE TO OPERATE
If unit fails to operate check the following:
1. Is thermostat calling for heat?
2. Is main disconnect closed?
3. Is there a breaker tripped or a fuse blown?
4. Is gas turned on at meter?
5. Is manual shutoff valve open?
6. Is unit ignition system in lock out? If unit locks out again,
call service technician to inspect unit.
7. Is pressure switch closed? Obstructed flue will cause unit to
shut off at pressure switch. Check flue passage and outlet.
REPAIR PARTS
When ordering repair parts include the complete unit model
number listed on the unit rating plate. For example: MHU45/75
and HSU45/75.
Operating Instructions and Owner's Manual 04/07 Revision B #60016