46
BA ROTEX HPSU compact 4 - 09/2013
8
x
Faults and malfunctions
8.3 Fault codes
Circulation pump is
being excessively noisy
while running
Air in the water circuit
●
Bleed the entire water circuit.
Noises caused by vibrations.
●
Check the HPSU compact, its components and
covers to ensure they are fastened correctly.
Bearings damage in the circulation pump.
●
Have the system checked by a ROTEX heating
technician.
Water pressure at pump inlet too low.
●
Using the controller (rotary switch position
) check
whether sufficient water pressure (> 0.5 bar) is
available.
●
Check that the pressure gauge is working correctly
(connect an external pressure gauge).
●
Have the system checked by a ROTEX heating
technician.
Safety pressure relief
valve is leaking or
always open.
Expansion tank is defective.
●
Have the expansion tank checked by a ROTEX
specialist heating technician.
Water quantity or water pressure in the system
is too high.
●
On the controller (rotary switch setting
"Info"
)
check whether there is adequate water pressure
(> 0.5 bar) (must be below the stated maximum
pressure) and where necessary drain water off until it
lies mid-range.
Safety pressure relief valve is stuck.
●
Have the system checked by a ROTEX heating
technician.
Tab. 8-1 Possible malfunctions of the HPSU compact
Malfunction
Possible cause
Possible solution
Code
Error message
Component/Designation
Fault and possible causes
Display Internal
9001
80
Fault return sensor
Temperature sensor dis-
charge water temperature
Return line temperature sensor t
R2
defective.
9002
81
Fault flow sensor
Temperature sensor feed
water temperature
Flow temperature sensor t
V2
defective.
9003
89
Fault frost protec-
tion function.
Failure of the frost protec-
tion function of the water
heat exchanger
Failure of the frost protection function of the water heat exchanger
because the water flow is too low. See fault code "7H".
Failure of the frost protection function of the water heat exchanger
because there is a lack of refrigerant in the system.
9004
7H
Fault flow rate
Flow disruption water cir-
cuit
Water flow is too low or there is none at all, minimum water flow
required:
– HPSU compact 4-8 kW: > 720 l/h
– HPSU compact 11-16 kW: > 900 l/h
Check the following items:
●
All stop valves of the water circuit must be completely open.
●
Optional water filters must not be contaminated.
●
System must run within its operating parameters.
●
System must be completely evacuated.
●
Using the controller (rotary switch position
) check whether
sufficient water pressure (> 0.5 bar) is available.
●
The external static pressure must correspond to the character-
istic curve in the technical data for the heat generator.
A higher pressure indicates internal resistance in the water
circuit.
●
Expansion tank is defective.
●
If this fault occurs during defrost operation in the operating
mode room heating or hot water supply: With optional backup
heater: Check its power supply and fuses.
●
In the switch cabinets of HPSU compact, check the pump
fuse (FU1) and circuit board fuse (F1).
Summary of Contents for HPSU compact 304
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