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Lack of heat
1. Check that the room thermostat is set to the desired tem-
perature.
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
several 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 Clean Air Furnace.
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 domestic hot water use.
7. Air may still be in the water lines. If so, re-purge the sys-
tem according to the start up procedure.
8. Confirm that the inlet and outlet pipe connections 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.
HRV core freezes up
1. Make sure that the supply and exhaust lines are balanced
according to the "Balancing Procedure" in this manual.
2. If out of balance, ensure that the balancing dampers have
not been moved and that there are no obstructions in the
outside hoods.
During cooling cycle, hot water circulates 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 instal-
lation or service and foreign debris enters the piping. This
debris can settle under the check valve seat and permit hot
water to flow into the coil. The problem can be corrected by
repeatedly flushing the heating loop until it is clean.
Water sits in drain pipes
1. Check drain pans or lines for plugs.
2. Confirm that the HRV core is installed according to man-
ufactures recommendations.
3. Check the drain line for kinks.
4. Make sure that the O-ring in the drain nozzles sit flat.
5. Ensure the drain line has enough "fall" to it.
Condensation/ice forming inside ventilation ducts
A rip in the vapor barrier or poorly sealed joints may cause
condensation or ice to form on the ducting. If this occurs,
replace the entire line.
Troubleshooting