Rotex HPSU compact (V5) Installation And Maintenance Manual page 65

8 x Errors, malfunctions and messages
Code Malfunction /
Error message
Display Internal
Flow measure-
E198 —
ment not plausible
Communication
E200 —
fault
Water pressure in
E8005 — the heating system
too low
E8100 — Communication
Temporary internal
E9000 —
message
Pressure loss
W8006 —
warning
Water pressure in
W8007 — the heating system
too high
Tab. 8-2 Error codes on the main control unit of HPSU compact
Respect the maximum tightening torque of the temper-
ature sensor (see chapter 10.3 "Tightening torque").
66
Component/Designation
Flow sensor FLS,
3-way diverter valve
3UVB1
Electrical components
Pressure sensor DS
Electrical components
—
Pressure sensor DS
Causes and possible error correction
Error occurs if the 3-way diverter valve 3UVB1 is in the Bypass po-
sition, the device-internal circulation pump is running, but the vol-
umetric flow measurement is too low.
Minimum water flow required:
– Operating mode "Heating": 600 l/h
– Operating mode "Cooling": 840 l/h
– Automatic defrosting function (
– Air in heating system.
Vent.
– Device-internal circulation pump not running.
Check electrical connection and control settings. If the
circulation pump is defective, replace it.
– Flow sensor FLS contaminated, blocked.
Check, clean.
– Flow sensor FLS defective.
– Valve drive for 3-way diverter valve 3UVB1 defective.
Check, replace.
Modbus communication between RoCon BM1 and switchboard
A1P is disrupted.
– Check RTX-AL4 switch board.
– Cabling or connections, poor contact.
Check, replace
Water pressure has fallen below the minimum permissible value.
– Too little water in the heating system.
Check heating system for leakage, refill water.
– Pressure sensor DS defective.
Check, replace.
Modbus initialisation also failed after heat pump start-up.
Circuit board A1P defective.
Check, replace.
Not relevant to proper system operation.
Warning message: Maximum permissible pressure drop
exceeded.
Too little water in the heating system.
Check heating system for leakage, refill water.
Warning message: Water pressure has exceeded the permissible
maximum value.
– Membrane expansion vessel defective or incorrect pressure
set.
Check, replace.
– Setting for the [Max Pressure] parameter too low.
If necessary, set parameter. If setting correct,
– Drain water to reduce the system pressure.
FA ROTEX HPSU compact (V5) •
) active: 1020 l/h