Operating and fault displays
Condens 7000 F – 6720871560 (2019/11)
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14.2
Service displays
Table 16 Service displays
14.3
Control unit fault displays
SC
1)
1) Service Code SC (is indicated on the display of the user interface)
FC
2)
2) Fault Code FC (indicated on the display of the user interface)
Description
Possible cause
Action
H03
1013
Hours run expired
The set number of hours run until
maintenance is due has been exceeded.
▶ Carry out maintenance.
H06
1016
Frequent flame interruption
During the last burner starts, the flame was
frequently lost.
Faulty ignition system.
Faulty burner setting
Faulty burner components
Blocked flue gas/supply air route
To check in which operating phase the loss of flame
occurred.
▶ Read out the fault memory of the blocking fault.
▶ Check gas supply.
▶ Check for blocking of supply air intake / flue
outlet apertures and flue gas/supply air route.
Eliminate blocking.
▶ Check the flame sensor current with user
interface.
▶ Check ignition by performing a function check/
relay test with the user interface.
▶ Check burner setting against burner setting
table; correct if required.
If other blocking faults are present (loss of flame
after the flame was successfully established):
▶ Check burner setting against burner setting
table; correct if required.
▶ Check gas supply equipment.
▶ Check plug assignment of 1st/2nd solenoid
valve.
H07
1017
Water pressure too low
The water pressure is not correct. The
pressure sensor is defective.
▶ Check water pressure.
▶ Add water if necessary, and vent the heating
system.
▶ Replace pressure sensor.
H08
1018
Service time expired
The maintenance date set has been
reached.
▶ Carry out maintenance.
Type
1)
Error
code
Sub-
code
Cause
Description
Test procedure/Cause
Action
B
2E
207 Water pressure
< 0.8 bar.
-
Check whether the pressure in the
system is at least 1.2 bar.
▶ Adjust operating pressure.
V
2U
533 Incorrect
hydraulic
connection of
floor standing
boiler or pump
The floor standing boiler
control unit has detected
an incorrect flow on the
water side.
Make sure the boiler flow and return
have not been swapped round.
Check pump for correct direction of
flow.
▶ Connect the flow and return
correctly.
▶ Ensure correct pump flow direction.
B
2U
565 Excessive
differential
between the flow
and return
temperature.
> 60 K
Heat exchanger cut-out
due to excessive
temperature difference.
System configuration problems.
▶ Check the system hydraulics.
V
2U
575 Intelligent high
limit safety cut-out
(ISTB) for the flow
The actual boiler flow
temperature reaches the
intelligent high-limit safety
temperature for the flow of
140 °C, and an ionisation
current is detected or the
solenoid valves are open.
Check the flow rate on the water
side.
▶ Ensure sufficient flow.
▶ Replace the boiler water
temperature sensor/high-limit safety
cut-out.
▶ Replace ignition/monitoring
electrode.