DeDietrich C230 ECO-A 120 Installation, Operating And Service Manual page 70

11 Control stops and faults
Code Des cription
14
Water pressure too low
15
Gas pressure too low
Configuration fault or SU
16 *
not recognised
Configuration fault or
17 *
default parameters table
incorrect
Configuration fault or
18 *
parameter storage unit
(PSU) not recognised
Configuration fault or dF-
19 *
dU parameters unknown
Configuration procedure
20 *
active
Communication fault with
21
SU-01
No flame during
22
operation
24 VPS test failed
70
Possible cause
existent

SCU PCB not present
(any longer) in boiler

Water pressure non-
existent or too low

Incorrect water pressure
parameter adjustment

Water leakage

No flow or insufficient
flow

Incorrect GPS switch
adjustment

Wiring defect or switch
faulty

Incorrect SU PCB for
this boiler

PCU-01 unit parameters
incorrect

Incorrect PSU PCB for
this boiler

Standard briefly
activated following boiler
switch-on

Bad connection

No ionization current

Gas pressure non-
existent or too low

Faulty gas valve

Incorrect adjustment of
the VPS switch

Wiring fault

Faulty VPS switch
Check/solution
Check:

Water pressure in the system

Minimum water pressure

That hydraulic pressure sensor is
properly installed /connected
Check:

That the gas cock is fully opened

That there is adequate gas
pressure

That the GPS switch is properly
installed

Replace the GPS switch if
necessary

Replace SU PCB

Replace PCU-01 unit

Replace PSU PCB

Add/check dF and dU

No action

Check that the PCB is inserted in
the correct connector
Check:

That the gas cock is fully opened

That the gas pressure is sufficient

That the gas block is
appropriately adjusted and
working correctly

Whether the air supply or flue gas
discharge are blocked

The flue gas circulation; inspect
the flue gas discharge system for
installation faults and the heat
exchanger for leaks
Check:

That the gas cock is fully opened

That the gas pressure is sufficient

That the VPS switch is properly
installed

Whether the gas valve is leaking
or in the open position

That the wiring is OK; mix up of
the V1 and V2 plugs

The adjustment of the VPS switch
C230 ECO-A