53
No.
Fault symptom
Possible cause
Explanation - Solution
27 The cooling system
does not cool down to
the set temperature.
1. When the water in the circulation circuit is un-
duly hot, Cooling mode starts with a delay for
the protection of the outdoor unit.
1.
Normal operation.
2. When the outdoor temperature is lower than
the preset temperature below which the
freeze stat. function is activated, Cooling
mode does not start running.
2.
To run Cooling mode overriding the freeze stat. function, adjust the preset tem-
perature below which the freeze stat. function is activated. (Refer to “<Freeze stat
function>” on Page 45.
28 The electric heaters
are activated shortly
after DHW or LP
mode starts running
after Cooling mode.
The setting time period of Heat-pump-only
operation is short.
Adjust the setting time period of Heat-pump only operation. (Refer to “<Electric heater
(DHW)> on Page 45.)
29 During DHW or LP
mode following the
cooling mode, error
L6 (circulation water
freeze protection)
occurs and operation
stops frequently.
If the preset temperature below which the freeze
stat. function is activated is low, error L6 is more
likely to occur interruption operation before the
freeze stat. function is activated.
Adjust the preset temperature below which the freeze stat. function is activated. (Refer
to “<Freeze stat function>” on Page 45.)
30 Heat pump is forced
to turn ON and OFF.
Smart grid ready input (IN11 and IN12) is used, and
switch-on and off commands are input.
Normal operation no action necessary.
8. Troubleshooting
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