33
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,operating the remote
control.
it starts operation without •
•
•
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.
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