Download Mestek SEPARATED COMBUSTION GAS FIRED PROPELLER UNIT HEATER Specifications

Table 8 - Separated Combustion Tubular Propeller Troubleshooting with LED Indicator Assistance
No Cycling or appliance power
INDICATES
CHECK/REPAIR
LED STATUS
or thermostat call for heat
Slow Flash
Control OK, no call for heat.
Not Applicable
since appliance failure has
Fast Flash
Control OK, call for heat present.
Not Applicable
occured.
Line voltage power can
cause product damage,
severe injury or death.
Only a trained experienced
service technician should
perform this troubleshooting.
1. Check the system thermostat to make sure it is calling for heat. (Do not cycle
the thermostat on and off at
this time.)
2. Remove the appliance
burner compartment door.
Do not interrupt power
to the control board by
opening any electrically
interlocked panels.
3. Observe the LED indicator
on the control board (a
greem LED labeled “OK”
indicates system faults);
check and repair system
as noted in the chart to the
right.
*NOTICE: Air flow proving
switch and power ventor
hose barbs must be free
of any dust or debris at all
times. Periodically check
these openings and/or if any
problems occur.
Steady Off
Internal control fault, or no power.
1. Line voltage on terminals 120
and C on transformer.
2. Low voltage (24V) on terminals
24 and C on transformer.
3. 5 Amp fuse on circuit board.
Steady On
Control internal failure or bad ground.
1. Common side of transformer
grounded to chassis.
2. Loose spark ignitor.
2 Flashes
In lockout from failed ignitions
or flame losses.
1. Gas supply off or gas supply
pressure too low.
2. Flame sense rod contaminated
or loose wire.
3. Gas valve switch is off or wires
are not connected.
4. Broken or cracked porcelain on
flame probe or spark ignitor.
3 Flashes
Pressure Switch open with inducer on
or closed with inducer off.
1. Obstructions or restrictions
in appliance air intake or flue
outlet are preventing proper
combustion airflow.
2. Moisture or debris in tubing that
connects pressure switch and
draft inducer.
3. Airflow switch jumpered or
miswired.
4 Flashes
Limit or rollout switch is open.
1. Open manual reset rollout switch.
2. Gas pressure too high, over fire
condition.
3. Incorrect airflow due to blockage
or motor not operating.
5 Flashes
Flame sensed while gas valve is off.
1. Flame probe miswired
or shortened.
6 Flashes
On-board microprocessors disagree.
1. Thermostat is interfering
with control board.
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