Pioneer WYD009AL3JAR-L, Service Manual

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Symptom : Water dripping from the indoor unit.
Reason : Misaligned installation leveling, blocked drain tube, frozen coil.
Solution : Check that the indoor unit is installed in a perfectly horizontal position. Check that the end of
the drain hose is dripping water properly on the outside. Check that the drain tubes are not kinked, blocked or
siphoned. Assure that the drain hose stays as low as possible in the wall hole and has a continual proper
declination in its level. Check the evaporator coil if frozen. This can be the indication of refrigerant loss from the
system. Check and assure correct operating pressures. Check for kinks in copper lines. Always close all open
windows and doors to avoid excessive humidity entering the room.
Symptom : Excessive vibrations from the compressor carried all the way through the copper tubing.
Reason : Excessive refrigerant charge, high pressure (usually in heat mode).
Solution : Check for and obtain proper operating pressures. Reduce the refrigerant if overcharged.
Symptom : Frozen indoor coil (Cooling Mode)
Reason : Low refrigerant, dirty filters, dirty evaporator, or very low outdoor temperature.
Solution : System cannot operate in cooling mode at outdoor temperatures below 65F without installing
an optional low ambient fan controller kit. Otherwise, check for low refrigerant. Clean the air filters and
maintain them as clean. Clean the coil if needed.
Symptom : Frozen outdoor coil (Heating Mode)
Reason : Normal Operation, Low refrigerant, dirty condenser or very low outdoor temperature.
Solution : During the heating operation the outdoor coil will normally freeze once in a while. The built in
defrost logic will handle this and defrost the accumulated ice as needed. Maximum time allowed for defrost is
10 minutes. In extreme conditions, this time may not be enough to fully defrost the coil but the system will stop
defrosting and switch to heating mode again. Additionally, system cannot operate in heating mode at outdoor
temperatures below 15F, which will be in efficient and causes more frequent freezing than normal. Otherwise,
check for low refrigerant charge and measure the pressures and obtain proper levels. Clean the coil if needed.
Symptom : Circuit breaker tripping
Reason : Damaged breaker, lower breaker amperage than needed, compressor overload.
Solution : Check for the breaker to function properly. Always use properly rated breaker for the required
amperage. Use power wires with proper gauge to allow for the minimum required circuit ampacity. If the
breaker is still tripping frequently, this is a sign of compressor overload or electrical shortage. Check for blocked
capillary tubes, closed valves, kinked line set, defective indoor or outdoor fan motors. Low or excessive
refrigerant charge. Check for wrong incoming power voltage. Never share any other appliance or device with
this heat pump, feeding power through the same circuit breaker.
Symptom : Insufficient heating or cooling
Reason : Low refrigerant, dirty condenser or evaporator, defective fan motor.
Solution : Check for the indoor and outdoor fans to be properly running (for the indoor fan check at high
speed). Check for dirt or dust accumulated on the heat exchangers, check outdoor units for blockage by debris
or being snowed in. Check for low refrigerant charge. Check for valves to be fully opened. Check for kinks on
copper tubing. Do not operate the system in cooling when the outdoor temperature exceeds 115F and in
heating when the outdoor temperature drops below 15F. Always locate the outdoor unit away from direct sun
shine, direct winds, heavy water or snow falling over, bushes and other obstacles blocking the air flow.
Symptom : Steam ‐ like air blowing out from the indoor unit air discharge in cooling mode.
Reason : Very high humidity conditions in the room.
Solution : Close all windows and doors to stop humidity entering the room from the outside.