A22 Coolant Pump Error - Panasonic 2WAY Multi Technical & Service Manual

A22 Coolant Pump Error

Error detection method
Errors can be determined when coolant pump rotations and driving meet the following conditions.
• When an error is triggered once owing to the coolant pump revolutions not increasing or not being able to be
detected when the engine is started up.
• When either overcurrent, insuffi cient revolutions or excessive revolutions are detected in the coolant pump
when the engine is operating, the engine will be momentarily halted and an error fl ag set. The reason for the
engine being shut down is due to the error fl ag being triggered fi ve consecutive times in one hour.
Troubleshooting
1
Is the voltage being supplied to the outdoor unit normal?
Power source 1-1
(Check to see whether the voltage is too low or unstable)
check
2 Are there any bad power cable connections when 3-phase
Coolant pump 2-1 equipment is in use? Or, is the power cable severed or the
connection faulty?
Is the coolant pump locked or are there any severed wires,
2-2 poor contacts or short circuits?
(Coil resistance should be around 14-18Ω for each phase.)
3 Has air entered the coolant circuit?
Coolant circuit (There is a chance of air having entered the circuit if
3-1
there is a slight banging noise and pump revolutions are
fl uctuating during coolant pump operations.)
4
Replace the outdoor unit's power board and keep an eye on the situation.
Outdoor unit's 4-1
Replace the coolant pump if the problem reoccurs.
power board
● For board and Electrical Wiring Diagram, see Chapter 6.
• Outdoor main board: page VI-2
• Outdoor power board: page VI-3
• Converter board: VI-4
• Indoor control board for DC motor models: page VI-5
• Outdoor Unit Electrical Wiring Diagram: page VI-6 *Reference (Electrical Wiring Diagram A-B-3)
IV–23
Yes 2-1
No Repair the power source
Yes 2-2
No Repair the power cable
Yes 3-1
Replace the coolant
No
pump
Yes 4-1
No Perform an air purge