Toshiba HWS-G2601ENXR-E - In the Event of Error - How to Operate BACK-UP Mode; Error Codes; Error Code Analysis

Domestic Hot Water Heat Pump Service Manual
45
9.2 In the event of an error – how to operate BACK-UP mode
In the event of an error occurring it is possible to produce domestic hot water by operating the
DHW-HP in Back-Up mode, for more information see section 7.4.
If Yes is selected the unit operates at the lower set point set by D12 (BACK-UP Temp)
Note: The Back-up mode uses the electric heater only to heat a smaller volume of water to set
point. In the 190l tank this is 80l and in the 260l tank this is 130l.
Code
Set point
name
Description
Range
Factory
setting
D12
BACK-
UP Temp
The water temperature at which the unit stops the backup mode with only
the electric heater.
0-65
35
9.3 Error codes
The following error codes are shown on the remote controller LCD screen at the time of a fault.
Class
Code
Menu Item
Description
Er
Er1
BT1 Error
The temperature sensor BT1 is out of range
Er2
BT2 Error
The temperature sensor BT2 is out of range
Er3
BT3 Error
The temperature sensor BT3 is out of range. If BT3 Error occurs, the unit does not heat the
water in any way
Er4
BT4 Error*
The temperature sensor BT4 is out of range. The error Er4 is ignored and the unit runs normally
Er5
BT5 Error*
The temperature sensor BT5 is out of range. The error Er5 is ignored and the unit runs normally
Er6
Err HP
The pressure switch opens, when the pressure in the heating circuit is above the limit of
pressure specified on the high pressure switch
Er7
Err Evap
The temperature sensor BT2 is above BT1 - 2°C for more than one hour
Er8
Err C Evap
The temperature BT2 is below - 25°C
Er9
Err H Evap
The temperature BT2 is above D11 (Evaporator T max)
Er10
Filter
Replace filter. The alarm is displayed on the main screen, but the operation of the unit is not
affected.
9.4 Error Code Analysis
Alarm Meaning Possible reasons Possible solutions
Er1, Er2,
Er3, Er4,
Er5
Temperature sensors out
of range
The temperature sensor BT1, BT2, BT3, BT4 or BT5
is defective or not connected to the PCB
Check that the sensor is connected to the PCB
Substitute the temperature sensor
Er- Err
HP
High pressure switch
High pressure in the heating system
Reduce the water temperature set point
Reduce the fan maximum speed in the installer
menu
High pressure switch BP1 is defective or not
connected to the PCB
Substitute component
Er 7 - Err
Evap /
Er9 - Err
H Evap
High evaporator
temperature
Wrong position of the temperature sensor
Check that BT2 is positioned in the evaporator
Leakage of refrigerant
Fix leakages and charge refrigerant
Er- Err C
Evap
Low evaporation
temperature
Mal-functioning fan
Make sure that the fan is connected to the PCB or
substitute the component
Low air flow
Increase the minimum fan speed in the installer
menu
Low air inlet temperature BT1
Increase the minimum air temperature in the
installer menu
Er10 -
Filter
Change filter
Substitute the air filter