Error Code [2520]; Error Code [2600] - Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook

[7-4 Error Code Definitions and Solutions: Codes [2000 - 2999] ]
7-4-9

Error Code [2520]

1. Error code definition
Abnormal water pressure rise
2. Error definition and error detection method
1) If any of the following is detected for the first time during operation, the water pump turns to antirestart mode for 3 minutes,
and automatically restarts after 3 minutes:
Indoor unit water pressure of 950 kPa [138 psi] or higher
Hydro unit PWD of 650 kPa [94 psi] or higher
Hydro unit PWS of 700 kPa [101 psi] or higher
2) If the above-mentioned pressure is detected again within 5 minutes after the first stop, the outdoor unit will make an error stop,
and the error code "2520" will be displayed.
3) If the pressure rise is detected again during operation after 5 minutes or longer from the first stop, the detection is regarded
as the first detection, and the operation described in step 1 above will start.
3. Cause, check method and remedy
(1) Clogged pipe
(2) Water pressure sensor error
(3) Circuit board error on indoor unit
(4) Failure in the indoor unit flow control valve
(5) Use of wrong expansion tank
(6) Use of wrong pipe
(7) Installation failure
BS_07_E
Cause Check method and remedy
Check the strainer for clogging. Check the flow rate
in the water circuit.
Check the pressure sensor value on the LED.
Check the operation of the flow rate control valve.
See [8-8-4 General Overview on FCV Operation
(Indoor unit)] for the valve operation.
Check the on-site circuit components for proper se-
lection. For the circuit restrictions, see the related
sections.
Check the water feed pressure.
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