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Control unit diagnostics
Displaying messages
Note
If a message was issued, initially determine the cause for the fault and remove
it. Returning the unit into use is only permissible for troubleshooting.
The unit must not be returned into use several times if a fault persists.
Code Description
E01
High pres-
sure fault
E02
Low pres-
sure fault
(automatic
reset up to
twice per
hour)
E05
Frost protec-
tion (auto-
matic reset
up to twice
per hour)
E06
Sensor ST2
(flow) faulty
E07
Sensor ST3
(at the air
heat exchan-
ger) faulty
(cont.)
Possible cause
Air heat exchanger con-
taminated
Incorrectly calibrated high
pressure switch
Excessive cooling load
(system incorrectly sized)
Fan faulty
Inadequate throughput in-
side the hydraulic circuit
(in heating mode)
Inadequate throughput in-
side the hydraulic circuit
Air heat exchanger con-
taminated
Filter dryer blocked
Inadequate throughput in-
side the hydraulic circuit
Short circuit, lead break or
sensor limits exceeded.
Short circuit, lead break or
sensor limits exceeded.
Troubleshooting
Measures
Clean the air heat exchan-
ger
Recalibrate the high pres-
sure switch
Check the system sizing
Check the fan and electrical
connections
Clean the water filter and in-
crease the heating water
throughput, if required
Clean the water filter; in-
crease the water through-
put, if required
Clean the air heat exchan-
ger
Replace the filter dryer
Clean the water filter; in-
crease the water through-
put, if required
Check sensor and replace, if
required
Check sensor and replace, if
required
25
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