Toshiba HWS-1501CSHM3-E(-UK), HWS-802XWHT6-E, HWS-802H-E, HWS-1402H-E Matters to be confirmed first

9-1. Matters to be confirmed first

9-1-1. Check the power supply voltage

Check that the power supply voltage is AC230 V±23 V. If the power supply voltage is not in this range, it may not operate normally.

9-1-2. Check for any miswiring of the connection cables between the hydro unit and the outdoor unit

The hydro unit and the outdoor unit are connected with three connection cables. Make sure the interconnecting connections between the hydro unit and the outdoor unit terminal blocks are connected to the correct terminal numbers. If not connected correctly, the heat pump system does not operate. However, a miswiring would not cause damage to the equipment.

9-1-3. About the installation of the temperature sensor

If each sensor is removed due to the replacement of the water heat exchange or inverter board, or the replacement of the refrigeration cycle parts, make sure to put the sensor back to the position where it was before.

•Each sensor position has a marking. Make sure to put it back to the exact position.

•Make sure to install it with a sensor holder so that the temperature sensing part of the sensor and the straight part of the copper piping are attached with each other tightly.

•If the installation of the sensor is incomplete or the installed position is wrong, it will not perform a normal control operation and may cause a defect such as a malfunction of the equipment or an occurrence of an abnormal sound, etc.

9-2. Non-defective operation (program operation) … No fault code display appears.

In order to control the heat pump unit, there are the following operations as the built-in program operations in the microcomputer. If a claim occurs about the operation, please confirm whether it falls under any of the contents in the following table.

If it does, please understand that the symptom is not a defect of the equipment, and it is an operation necessary for the control and maintenance of the heat pump unit.

Table 9-2-1 Non-defective operation

No.	Operation of the heat pump system	Explanation
	The compressor sometimes does not operate even within the	The compressor does not operate during the operation of the
1	range of compressor “ON”.	compressor reboot timer (3 min). Even after the power
		activation, the compressor reboot timer continues to be active.
	During the hot water supply or heating operation, without	It may be caused by the high temperature release control
2	reaching the set temperature, the compressor operation	(release protection control by the temperature of the water
	frequency stays at a frequency of less than the maximum Hz or	heat exchanger) or the current release control.
	lowers down.
	The “Stop” operation on the remote control will not stop the	In order to deal with the temperature increase in the heat
3	circulating pump. (The same for hot water supply, heating and	exchanger after stopping, the operation continues for 1 min
	cooling)	after the compressor is stopped.
	“ON” on the remote control will not operate the compressor. (It	When the outdoor temperature (TO sensor detection
4	will not operate even after the reboot delay timer elapsed)	temperature) is -20°C or lower, the heat pump will not operate
		in order to protect the compressor, and the heater will operate
		instead.
	When the power is turned on, it starts operation without	• The auto restart operation may be working.
	operating the remote control.	• The antifreeze operation may be working.
5		• If the TWI, TWO or THO sensor detects a temperature
		below 4°C, the operation changes from circulating pump
		--->> circulating pump + heater.)

65