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Troubleshooting
Lack of heat
1. Check that the room thermostat is set to the
desired temperature.
2. Confirm the units have power and the shut-off
valves are open.
3. Ensure there is power to the unit and that the
pump is working. If the pump is not working
properly, it may be stuck. Disconnect power
and remove screw in center face of the pump.
Using a screwdriver, turn the pump shaft sev-
eral times to free it from sticking. Replace
center-screw and re-connect power. If pump
still fails to start, it may require replacement.
4. Confirm that the hot water heater is working
and that hot water is entering the Air Handler.
5. Verify that the airflow in and out of the system
matches designed specs. If airflow is low,
check for blockage in the filter or some other
obstruction.
6. Make sure your water heater is sized large
enough for heat load of house and for domes-
tic hot water use.
7. Air may still be in the water lines. If so, re-purge
the system according to the start up
procedure.
8. Confirm that the inlet and outlet pipe connec-
tions are not reversed.
9. Ensure that there are no other restrictions in
the water lines, such as faulty valves or debris.
Pump is noisy
Pumps can become noisy when air remaining in
the lines interfere with their operation. If this
occurs, re-purge the system as indicated in the
Start-Up Procedure.
During cooling cycle, hot water cir-
culates through the coil
If the check valve inside the cabinet is stuck in the
open position, hot water may infiltrate the heating
coil. This occurs when the hot pipes are not
capped-off during installation or service and for-
eign debris enters the piping. This debris can set-
tle under the check valve seat and permit hot
water to flow into the coil. The problem can be cor-
rected by repeatedly flushing the heating loop
until it is clean.