55
Non-
defective operation (program operation)…….No Check code displayed
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.
No.
Operation of the heat pump system
Explanation
1
The compressor sometimes does not operate even
within the range of compressor “ON”.
The compressor does not operate during the
operation of the compressor reboot timer (3 min).
Even after the power activation, the compressor
reboot timer continues to be active.
2
During the hot water supply or heating operation,
without reaching the set temperature, the compressor
operation frequency stays at a frequency of less than
the maximum Hz or lowers down.
It may be caused by the high temperature release
control (release protection control by the
temperature of the water heat exchanger) or the
current release control.
3
The “Stop” operation on the remote control will not
stop the circulating pump. (The same for hot water
supply, heating and cooling)
In order to deal with the temperature increase in
the heat exchanger after stopping, the operation
continues for 1 min after the compressor is
stopped.
4
“ON” on the remote control will not operate the
compressor. (It will not operate even after the reboot
delay timer elapsed)
When the outdoor temperature (TO sensor
detection temperature) is -20°C or lower, the heat
pump will not operate in order to protect the
compressor, and the heater will operate instead.
5
When the power is turned ON it starts operation
without operating the remote controller
•
•
•
The auto restart operation may be working.
The antifreeze operation may be working. If
the TWI, TWO or THO sensor detects a
temperature below 4°C, the operation
changes from circulating pump --->>
circulating pump + heater.)
Defective operation check codes
How to determine from the check code on the remote
control
If the defect is limited by the check code displayed on the remote control, please repair the defect based on
the table on the next page.
The check codes are separated into two groups: software
and hardware errors.
Since a hardware error cannot be cancelled without a part
replacement etc., please perform a repair.
If its abnormality is determined, the abnormality is noticed
by indicating the check code on the remote control check
code display part while letting off a buzzer.
How to cancel a check code on the remote controller
(1) Press
or
button (on the operation side) to clear the check code.
(2) Press
to stop a buzzer for an abnormality only.
Although the above procedure cancels the check code, the hardware error will be displayed again until the
hardware repair is completed.
