Mitsubishi PWFY-P36NMU-E-BU Service Handbook page 51

1. Error Code
2135
Water heat exchanger freeze up
2. Error definition and error detection method
Both TH22 and TH23 of 1˚C [ 34 ] or below have been detected for three minutes in a mode other than Heating Thermo-ON.
Condition 1
If PWFY is running in Heating Thermo-ON mode
when the defrost cycle starts
Condition 2
If PWFY is running in a mode other than Heating
Thermo-ON mode when the defrost cycle starts
TH22 of -8˚C [ 18 ] or below has been detected for 90 seconds
Condition 3
running in modes other than Cooling Thermo-ON.
TH6 or TH8 of 2˚C [ 36 ] or below has been detected while the PWFY unit is in operation.
Condition 4
Condition 5 The PWFY unit has a power failure while the outdoor unit is in the defrost cycle.
For a period of 60 minutes after the units came to a stop is considered a preliminary error.
3. Cause, check method and remedy
C a
(1) Pump is not connected properly.
Shortage of circulating water
(2) Thermistor fault
( ) 3 Disconnected thermistor connector
u s e
TH22 of -15˚C or below has been detected for 3 continuous minutes
starting from 2 minutes after the start of the defrost cycle.
TH22 of -15˚C or below has been detected for 3 continuous minutes
starting from 4 minutes after the start of the defrost cycle.
except during the defrost cycle and while PWFY is
C h e k c m e h t
Check the pump for proper connection.
Check the amount of circulating refrigerant.
Replace thermistor TH6, TH8.
Check the thermistor connector.
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