P20 Refrigerant High-Pressure Error - Panasonic 2WAY Multi Technical & Service Manual

P20 Refrigerant High-Pressure Error

Error detection method
• When the high pressure sensor value ≥ 3.75 MPa during engine operation, the engine stops and an error fl ag
is set. A Refrigerant Pressure Too High fault is assumed when this fl ag has stopped the engine 5 consecutive
times in 1 hour.
• When revolution speed setting is more than minimum revolution speed and fan frequency is less than 50% of
maximum frequency, an error is not generated. (The engine stops momentarily.)
Troubleshooting
1
Cooling/
1-1 Operating in the cooling mode or heating mode?
heating
mode
2
Is the heat exchanger clogged by foreign matter or other
2-1
Outdoor
debris (visual inspection)?
unit's heat
exchanger
2-2 Is there an air shortage?
check
2-3 Is the fan on the outdoor unit operating?
3 Are there any crushed tubes, torn strainers, closed servicing
Tubing 3-1 valves, or other problems? Check the temperature of the
indoor unit's coil.
4
Unit check
Which is connected, an indoor unit or a water heat exchanger
4-1
unit?
5
5-1 Is the air fi lter on the indoor unit clogged?
Indoor
unit's heat
exchanger
5-2 Is the fan on the indoor unit operating?
check
6 Check the indoor unit's motor-operated valve. Does the valve
Indoor unit's 6-1 open? (Check the indoor unit's heat exchanger temperature
motor- when in the heating mode.)
operated
valve check Check the indoor unit's control board. (Is there any voltage
6-2 between No. 5 (+) and No. 1-4 (-) of the indoor unit's control
board PMV6P (white) CN082 when the power is switched on?)
Check the motor-operated valve coil. (Does a resistance of
6-3 approximately 46 Ω exist between No. 5 and No. 1-4 of the
motor-operated valve connector 5P (white)* or 6P (white)?)
7 Are indoor unit's coil sensors E1, E2, and E3 disconnected
Indoor unit's 7-1 from their measurement points? Check this by displaying the
coil sensor indoor coil temperature on the outdoor unit.
8
Is a correct cold/hot water (brine) fl ow volume being
Cold/hot
8-1
maintained?
water check
8-2 Is the cold/hot water (brine) pump operating?
IV–96
Cooling 2-1
Heating 3-1
Yes Remove
No 2-2
Revise
Yes
installation
No 2-3
Yes 12-1
Refer to section
No
P22
Yes Repair
No 4-1
Proceed to 5-1 when the
indoor unit is connected
Proceed to 8-1 when the
water heat exchanger unit is
connected
Yes Clean the fi lter
No 5-2
Yes 6-1
No Repair
Yes 7-1
No 6-2
Yes 6-3
Replace the
No indoor unit's
control board
Replace the
Yes
valve
Replace the
No
valve coil
Yes Repair
No 11-1
Maintain the
Yes
rated fl ow volume
No 8-2
Yes 9-1
No Repair