Method Of Defect Analysis; Matters To Be Confirmed First; Check The Power Supply Voltage; Check The Cold Water Supply - Toshiba HWS-G1901CNMR-E Service Manual

Domestic Hot Water Heat Pump
9.0

Method of defect analysis

9.1

Matters to be confirmed first

In addition check out the following questions before contacting an installer
• Is the cold water supply open?
• Has the periodic cleaning of evaporator, condensation drain and fan as described in the
maintenance section been followed?
• Has any of the safety features disengaged the heat pump/electrical emersion heater?
• Has external short-circuiting of terminals disengaged the heat pump?
• Has factory resetting been tested?
• If it is not one of the above errors, please contact;
In the warranty period (0-2 years): The distributor, from which the unit was purchased. After the
warranty period (> 2 years): The distributor from which the unit was purchased or partners of
the manufacturer
Please have data from name plate ready (silver plate on the unit).
Problem Possible reasons
The unit is not connected to the power supply
Alarms from the controller stop the operation of the unit
The product
Low water temperature set points
does not
supply hot
Low airflow in evaporator
water
Fan does not work
SG Ready function is active
Thermal safety switch FN1 opens and stops the power
supply to the electric heater
Too high maximum fan speed
Obstruction of the air ducts.
High sound
emissions
Dirt on fan or evaporator.
Components vibration
9.1.1 Check the supply voltage
Ensure the power is switched on and the display is on and that the voltage is correct, the voltage
should be between 220VAC & 240VAC
Note: For the Deluxe model an extreme low voltage may result in the DHW-HP running as a
Standard unit.

9.1.2 Check the cold water supply

Ensure the cold water feed is turned on and there is water flow.
Note: If the unit is low on water or has been switched off: turn on the water supply and bleed the
DHW-HP by opening a tap at the furthest point from the unit to 'bleed' the system.
Possible Solution
Make sure the display turns ON
Check the alarms in the Info menu Er
Increase all temperature set points in menu A Temperatures
Clean the evaporator and the air ducts
Make sure that the fan is connected to the
PCB or substitute the component.
Switch OFF SG Ready function
Restore the original conditions of the thermal safety switch FN1.
Reduce the fan maximum speed in the
Installer menu
Activate the SILENT mode
Remove the obstruction
Clean the evaporator and the fan. Do not use cleaning spray that can
be damage the EPS housing
Make sure all components as compressor and solenoid valve are well
fastened
44
Service Manual