Error Code [2501] (Water Pump Fault) - Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook

[7-4 Error Code Definitions and Solutions: Codes [2000 - 2999] ]
7-4-3

Error Code [2501] (Water pump fault)

1. Error code definition
Water pump fault
2. Error definition and error detection method
When clogged water circuit or water leaks from the water circuit is detected, the water pump is stopped for protection.
When the following statuses are detected, the pump will be stopped.
Pw2-Pw1 < 10
TH32 ≥ 60°C
TH35 ≥ 53°C
3. Cause, check method and remedy
(1) Water circuit is clogged.
(2) Water leaks from the water circuit
(3) Air infiltration through the air vent valve
(4) Broken or semi-broken thermistor wire
(5) Thermistor failure
(6) Semi-broken pump wire
If a sudden water leak occurs, replace the water pressure protection valves because they may be the cause.
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- chapter 7
Cause Check method and remedy
1) Check for tightened water flow rate control valves or
field-installed valves.
2) Check the pump for proper sound.
If there is air in the circuit, it makes a noise.
3) Check that any air vent valves are not installed in the wa-
ter circuit on the suction side water pump.
If an air vent valve is installed in the water circuit on the
suction side water pump, it will cause the air infiltration.
4) Check for a broken thermistor wire.
5) Check the resistance of the thermistor.
0°C [32°F] : 15kΩ
10°C [50°F] : 9.7kΩ
20°C [68°F]: 6.4kΩ
30°C [86°F] : 4.3kΩ
40°C [104°F] : 3.1kΩ
6) Check for semi-broken pump wires.
BS_07_E