Mitsubishi Electric ecodan ECOSLIM150L-PP-MEUK Installation Manual page 73

Troubleshooting
28
XXXXXXXX XXXXXXX
No. Fault Symptom
28 Cooling mode is NOT
available.
29
The cooling system
does not cool down to
the set temperature.
30 The electric heaters are
activated shortly after DHW
or LP mode starts running
after Cooling mode.
31
During DHW or LP mode
following the cooling mode,
error L6 (circulation water
freeze protection) occurs
and operation stops
frequently.
(continued)
Possible Cause
Dip SW2-4 is OFF.
1. When the water in the circulation circuit
is unduly hot, Cooling mode starts with a
delay for the protection of the outdoor
unit.
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.
The setting time period of Heat-pump-only
operation is short.
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.
Pre-Plumbed Slimline Cylinder Installation Manual
Explanation - Solution
Turn Dip SW2-4 to ON. (Refer to "5.1 Dip Switch Functions" in this manual.)
1. Normal operation.
2. To run Cooling mode overriding the freeze stat. function, adjust the preset
temperature below which the freeze stat. function is activated. (Refer to
"<Freeze stat function>" on Page 49.
Adjust the setting time period of Heat-pump only operation. (Refer to "<Electric
heater (DHW)> on Page 47.
Adjust the preset temperature below which the freeze stat. function is activated.
(Refer to "<Freeze stat function>" on Page 49.
73