P19 Four-Way Valve Lock Error (Not Detected 3Way Multi - Panasonic 2WAY Multi Technical & Service Manual

P19 Four-way Valve Lock Error (not detected 3WAY MULTI)

Error detection method
• Determined after 6 minutes of complete combustion time has passed during heating operation.
• An error is determined in thermostat ON indoor units, when the highest indoor heat exchanger outlet (E3)
temperature is detected to be lower than the outdoor heat exchanger inlet for 5 minutes continuously.
• (W MULTI only) Handled as a fault only when four-way valve control (performed at fi rst startup following a
power supply reset or heating/cooling switch) fails.
• (W MULTI only) when a pressure differential fault (the high pressure of an outdoor unit working at full
combustion in proximity with an another outdoor unit working at low pressure) detected between W MULTI
outdoor units is assessed as a fault.
Troubleshooting (common)
1
Check the 4 way valve temperature during heater operation.
1-1
Check four-
Switched to heater side?
way valve
During heater operation, is the control board VRR connector
1-2
(CN033) voltage about AC0V?
"After stopped, turn OFF outdoor unit. Disconnect control
board VRR connector (CN033) and measure wiring
1-3
resistance. (Normal value: about 1kΩ) Short-circuited or
broken wire?"
2 Check wiring and thermistor for indoor units with no temperature increase. (Any broken wires
2-1
Actions or short-circuits?)
2-2 Replace power board.
2-3 Replace four-way valve coil and wiring
2-4 Replace 4 way valve.
● 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
Troubleshooting (W MULTI only)
1
(Check all W MULTI outdoor units)
Pressure
Is the actual difference between compressor inlet pressure
1-1
sensor
displayed on the outdoor main board and output pressure
inspection
(gauge data, etc.) 0.1 MPa or less?
2 Use a collective stop setting to temporarily stop the outdoor
Check unit and perform four-way valve adjustment control according
outdoor unit to one of the procedures described below.
operation After resetting the power supply on all W MULTI outdoor units,
2-1 use the remote controller or the outdoor main board to start
desired mode.
Use the trial operation setting from the outdoor main board or
the remote controller to switch between cooling and heating to
start operation.
Do all the W MULTI outdoor units start and continue running
2-2
for 5 minutes?
Check why operation does not continue and remedy the
problem.
When the device stops immediately after startup
2-3 → Check error history and use the code to fi nd
troubleshooting information.
When the system does not start up
→ IV - 1 (3) see section on engine start standby
2-4 Use a different mode (cooling or heating) to restart from 1-1.
If no error is found, keep under observation.
IV–95
Yes 2-1
No 1-2
Yes 2-2
No 1-3
Yes 2-3
No 2-4
Yes 2-1
Replace pressure
No
sensor
2-2
Yes 2-4
No 2-3
2-1