Fault Codes - Rotex HPSU compact 304 Instruction Manual

8 x Faults and malfunctions
Malfunction
Air in the water circuit
Noises caused by vibrations.
Bearings damage in the circulation pump.
Circulation pump is
being excessively noisy
while running
Water pressure at pump inlet too low.
Expansion tank is defective.
Safety pressure relief
Water quantity or water pressure in the system
valve is leaking or
is too high.
always open.
Safety pressure relief valve is stuck.
Tab. 8-1 Possible malfunctions of the HPSU compact

8.3 Fault codes

Code Error message
Display Internal
9001 80 Fault return sensor
9002 81 Fault flow sensor
Fault frost protec-
9003 89
tion function.
9004 7H Fault flow rate
46
Possible cause
Component/Designation
Temperature sensor dis-
charge water temperature
Temperature sensor feed
water temperature
Failure of the frost protec-
tion function of the water
heat exchanger
Flow disruption water cir-
cuit
Possible solution
● Bleed the entire water circuit.
● Check the HPSU compact, its components and
covers to ensure they are fastened correctly.
● Have the system checked by a ROTEX heating
technician.
● Using the controller (rotary switch position
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.
● Have the expansion tank checked by a ROTEX
specialist heating technician.
● 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.
● Have the system checked by a ROTEX heating
technician.
Fault and possible causes
Return line temperature sensor t
Flow temperature sensor t
V2
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.
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
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).
BA ROTEX HPSU compact 4 - 09/2013
defective.
R2
defective.
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