Toshiba HWS-G2601ENXR-E - Er1 ~ Er5 - Temperature Sensor Error Analysis; Er HP - High Pressure Switch Error Analysis

Domestic Hot Water Heat Pump Service Manual
46
9.4.1 Er1 ~ Er5 – Temperature sensor error analysis
Temperature sensor errors occur if:
The measured temperature is < -29 or >129
If the sensor is disconnected form the PCB, the measured value will be -30, so an error will occur.
The DHWHP operation is interrupted and the error is displayed only for BBT1, BBT2 and BBT3.
9.4.2 Er HP – High pressure switch error analysis
An error occurs if the gauge pressure in the refrigerant circuit reaches a value of 20bar
Is the BT temperature
sensor(s) positioned and
connected correctly?
No
Yes
Is the sensor(s)
correctly
positioned?
No
Move sensor(s) into
correct position
Is the sensor(s)
connected to
the PC board?
No
Connect sensor(s)
to the PC board
Is the BT temperature
sensor(s) characteristics
correct?
Yes
Check PC board and
replace if defective
Is the fan motor operating
correctly?
No
Yes
Is the fan motor
connected to
the PC board?
No
Connect fan motor
to PC board
Does the fan
motor turn?
No
Replace the fan
motor
Does the high pressure
switch automatically reset
when DHWHP stops?
No
Replace the high
pressure switch
Yes
Is the water temperature
set too high?
No
Lower the water set
point temperature
Yes
Check PC board and
replace if defective
Does the high pressure
switch automatically reset
when DHWHP stops?
No
Replace the high
pressure switch
Yes
Is the fan
speed set too
high?
No
Reduce the fan
speed
No
Replace the BT
temperature sensor