Thermo Pride MHA1-50N Installation And Service Manual page 52

All installations and services must be performed by qualified service personnel.
Yes
Does system run until
thermostat is satisfied?
Yes
Does burner shut off
when thermostat is
satisfied?
Yes
Does the circulating air
blower turn off after
thermostat is satisfied
within 180 seconds?
Yes
Troubleshooting Complete.
No
Is LED light on ignition
control module flashing?
If LED Light Flashes:
1 Flash, then pause............System lockout
2 Flashes, then pause........Pressure switch stuck closed
3 Flashes, then pause........Pressure switch stuck open
4 Flashes, then pause........Open high limit, aux. limit, or roll-out switch
6 Flashes, then pause........115 Volt AC power reversed
7 Flashes, then pause........Low flame sense signal
8 Flashes, then pause........Check ignitor or improper grounding
Continuous flashing............Flame has been sensed when no flame
(no pause) should be present (no call for heat)
No
Check for short in wire to
thermostat. Replace
thermostat if necessary.
Check DIP switch settings
No
on ignition control module
against those on connection
diagram. Reset if necessary.
48
No
Yes
Check all wiring for
loose connections.