Mitsubishi PWFY-P36NMU-E-BU Service Handbook page 50

1. Error Code
2000
Pump interlock error (BU only)
2. Error definition and error detection method
Preliminary pump interlock error is detected when the pump interlock circuit becomes open while the units are
stopped during Thermo-ON.
When a preliminary error is detected, units will go into the Thermo-OFF state and into the restart-prevention mode.
When the amount of time listed below has elapsed since the time when a given preliminary error was detected, an
error code "2000" will be detected, and the units will come to an abnormal stop.
DipSW3-10=OFF 9 seconds *1
DipSW3-10=ON 9 minutes and 59 seconds *1
*1 When the version of the software is before 1.24, this value will be 9 minutes and 59 seconds regardless of the
DipSW settings.
3. Cause, check method and remedy
C a
(1) Pump is not connected properly.
1. Error Code
2000
Flow switch error (AU only)
2. Error definition and error detection method
When the water flow rate of the water supply to the unit is the specified rate or less, the flow switch does not
detect, and the unit will be stopped.
3. Cause, check method and remedy
C a
(1) Water shortage
1. Error Code
2134
Abnormal water temperature
2. Error definition and error detection method
In the case of BU and WH, if the value of TH6 becomes equal to or greater than 85°C [185] , units will stop and
go into the 3 minute restart delay mode.
For a period of thirty minutes after units came to a stop is considered a preliminary error.
3. Cause, check method and remedy
C a
(1) Pump is not connected properly.
(2) Thermistor fault
( ) 3 Disconnected thermistor connector
u s e
u s e
u s e
C h e k c m e
Check the pump for proper connection.
Check the pump interlock circuit.
C h e k c m e
Check the water flow rate.
Check the strainer for proper operation.
C h e k c m e
Check the pump for proper connection.
Replace thermistor TH6.
Check the thermistor connector.
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