Error code Description troubleshooting
E3
“Total” outlet water temperature probe Tw fault
(only for master unit)
Only the master unit controls the sensor fault, the slave
unit does not control it.
When the number of units in line is 2 or more, check if
the Tw sensor is faulty or is not required.
When the number of units in line is 1, Tw = Two by
default; check if the Tw sensor is faulty or is not
required.
E4
Unit outlet water temperature probe - Two
1E5
air coil temperature probe - T3a
2E5
air coil temperature probe - T3B
E7
Outdoor air temperature probe - T4
E8 phases sequence
It is controlled continuously.
If the protection occurs on the master unit, all of the
units stop and reset automatically.
If the protection occurs on a slave unit, it stops and
resets automatically, the master unit and the other slave
units are not involved.
E9
from flow switch: no flow / sensor failure
from pressure switch: system low pressure /
sensor failure
To reset it is necessary to remove power
2Eb domestic hot water antifreeze alarm - Taf2
EC Slave unit module reduction
1Ed compressor drain temperature probe A
2Ed compressor drain temperature probe B
1EE
economizer inlet temperature probe -
T6a
2EE
economizer outlet temperature probe -
T6b
EF
Unit inlet water temperature probe -
Twi
EH autotest error
EP drain temperature probe
Detection begins 10 minutes after start-up.
The protection intervenes if the heating Pc is ℃ 3.5 MPa
for 2 minutes or cooling Tz℃ 56ºC and the drain
temperature Tpmax <15ºC.
The entire unit stops.
Turn the power off to reset it.
EU
total condenser output high temperature - Tz
P0 high pressure / drain temperature
If the protection intervenes 10 times in 150 minutes, turn
the power off to reset it
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