Electrical / Wiring Diagnostics; Piping Surface Temperature Diagnostics - Pioneer WYD009AL3JAR-L Service Manual

Symptom : System does not automatically restart after a power failure.
Reason : Auto Restart Function has been turned OFF.
Solution : Turn OFF the breaker, Press and hold the emergency restart button and turn the breaker ON
while still holding the button pressed for 10 more seconds. 5 beeps indicate activation of the Auto Restart
function. Repeat the procedure for tuning OFF the auto restart function in not desired (Indicated by 3 beeps).
Symptom : Indoor unit blows smelly air.
Reason : Dirty filters and/or evaporator coil.
Solution : Clean the filters. If the coil is dirty have the evaporator professionally cleaned. Run the unit for
several hours in FAN ONLY mode to dry it before preparing to leave the system OFF for long periods of time.
Symptom : Uncomfortably wide temperature swings in the room.
Reason : Indoor unit installed too high, filters dirty, Room temperature sensor deficiency.
Solution : Higher locations in the room will have warmer temperatures and the system will measure the
temperature at the height the indoor unit is installed. User can compensate for this by setting the temperature
settings slightly lower or higher than actually desired. Clean the filters weekly for best performance. Check the
return air sensor and replace if needed.
Symptom : System does not respond to commands from the remote controller.
Reason : Remote is located far away, weak remote batteries, disconnected display board/
Solution : Place the remote nearby and retry. Replace the batteries. Check the connection cable between
the display board and the main controller board.
Electrical / Wiring Diagnostics:
1. 110‐120 VAC Models:
a. Check the voltage between the L and N terminals on the indoor unit. It should be always 110~120V.
b. Check the voltage between the L and N terminals on the outdoor unit. It should be always 110~120V.
c. Check the voltage between two L terminals (left and right) on the outdoor unit. It should always 0 V.
d. For the compressor to run, the voltage between the 1 and N terminals at BOTH the outdoor and indoor
units' terminal blocks must be measured as 110~120 VAC.
e. For the outdoor fan motor to run, the voltage between the 2 and N terminals at BOTH the outdoor and
indoor units' terminal blocks must be measured as 110~120 VAC.
f. For the heat mode to be activated, the voltage between the 3 and N terminals at BOTH the outdoor and
indoor units' terminal blocks must be measured as 110~120 VAC.
2. 208‐230 VAC Models:
a. Check the voltage between the L1 and L2 terminals on the indoor unit. It should be always 208~230V.
b. Check the voltage between the L1 and L2 terminals on the outdoor unit. It should be always 208~230V.
c. Check the voltage between two L1 terminals (left and right) on the outdoor unit. It should always 0 V.
d. For the compressor to run, the voltage between the 1 and L2 terminals at BOTH the outdoor and indoor
units' terminal blocks must be measured as 208~230 VAC.
e. For the outdoor fan motor to run, the voltage between the 2 and L2 terminals at BOTH the outdoor and
indoor units' terminal blocks must be measured as 208~230 VAC. (#2 is not accessible for 024 Indoor).
f. For the heat mode to be activated, the voltage between the 3 and L2 terminals at BOTH the outdoor and
indoor units' terminal blocks must be measured as 208~230 VAC. (#3 is not accessible for 024 Indoor).
Piping Surface Temperature Diagnostics:
a. In Cooling mode, the smaller diameter pipe must feel Very Cold and the larger diameter pipe must feel Cold.
b. In Heating mode, the smaller diameter pipe must feel Hot and the larger diameter pipe must feel Very Hot.