Rotex HPSU compact 304 System Instructions

4 x Faults and malfunctions
FA ROTEX RoCon HP - 03/2013
31
4.3 Fault codes
Safety pressure relief
valve is leaking or always
open.
Expansion tank is defective. Ɣ Replace expansion tank.
Water quantity or water pressure in the sys-
tem is too high.
Ɣ On the controller (rotary switch setting "Info" )
check whether there is adequate water pressure 
(> 0.3 bar) (must be below the stated maximum
pressure) and drain water off until it lies mid-range.
Safety pressure relief valve is stuck.
Ɣ Check safety pressure relief valve and if necessary,
replace it.
– Turn the red knob on the safety pressure relief
valve counterclockwise. If you can hear a rattling
noise, the safety pressure relief valve needs
replacing.
– Close the inlet and discharge stop valve if water is
continuously escaping.
Tab. 4-1 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 DHW sensor
Temperature sensor feed
water temperature
Flow temperature sensors t
V1
and t
V2
are defective.
9002 81
Temperature sensor dis-
charge water temperature
Return temperature sensors t
R1
and t
R2
are 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 (
t12 l/min). Check the following items:
Ɣ All stop valves of the water circuit must be completely open.
Ɣ Optional water filters must not be contaminated.
Ɣ System must run within its operating parameters.
Ɣ System must be completely evacuated.
Ɣ On the controller (rotary switch setting "Info" ) check
whether there is adequate water pressure (> 0.3 bar).
Ɣ 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.
Ɣ Expansion tank is defective.
Ɣ 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.
Ɣ In the switch cabinets of HPSU compact, check the pump
fuse (FU1) and circuit board fuse (F1).
9005 8F
Flow temperature
> 75 °C
Outlet water temperature
in HPSU compact > 75 °C
Discharge water temperature in HPSU compact is too high 
(> 65 °C).
– Temperature sensor discharge water temperature pro-
vides incorrect values.
– With installed backup heater: STB in backup heater (BUH)
has triggered.
9006 8H
Flow temperature
> 65 °C
Outlet water temperature
in HPSU compact > 65 °C
9007 A1
IG main board
defective
PCB A1P HPSU compact Malfunction message. Contact ROTEX heating technician.
9008 A5
Refrigerant tem-
perature
9009 AA
STB fault
Optional: STB backup
heater (BOH)
STB in backup heater (BUH) has triggered.
Ɣ Check and unlock position of STL.
9010 AC Bridge on board A1P Bridge of connection socket "X21A" missing on the board A1P.
9011 C0 Fault flow sensor FlowSensor Flow sensor on HPSU compact is defective.

Rotex HPSU compact 304 Specifications

General

Brand	Rotex
Model	HPSU compact 304
Category	Controller
Language	English