Control Stop - And Fault Memory - DeDietrich C230 ECO-A 120 Installation, Operating And Service Manual

11 Control stops and faults
Fault
Description Possible
code
E:17 Gas valve control fault
Flow temperature sensor
E:32
short circuited
Flow temperature sensor
E:33
open circuit
E:34 Fan fault
E:35
Flow and return swopped
Flame loss occurs 5
E:36
times
Communication fault with
E:37
SU board
Communication fault with
E:38
SCU board (optional)
Shutdown input in
E:39
locked-out mode
Table 20 Fault codes

11.5 Control stop - and fault memory

74
cause

Bad connection

Defective gas valve

Bad connection

Defective sensor

Sensor not correctly
mounted

Bad connection

Defective sensor

Sensor not correctly
mounted

Bad connection

Defective fan

Defective sensor

Wrong flow direction

Bad sensor connection

Sensor not correctly
mounted

Ionization current drops
out

Bad connection

Bad connection

External cause

Incorrectly set
parameter

Bad connection
The boiler control unit has a control stop and fault memory. This
stores the last 16 control stops and the last 16 faults that have
occurred.
With each fault, the following data is saved:
 b or e = control stop or fault code
Check/solution

Check the cable bundle

Replace the gas valve if
necessary

Check the cable bundle

Replace the sensor if
necessary

Check if sensor is correctly
mounted

Check the cable bundle

Replace the sensor if
necessary

Check if sensor is correctly
mounted

Fault in fan cabling

Defect in fan

(Too) much draught over boiler,
so that the fan starts to rotate

Check:

Flow direction

temperature sensors for
deviations

Replace the sensor if
necessary

Inlet gas pressure sufficient?
Inlet gas pressure controller in
order?

Correct gas block operation
and adjustment?

Blockage in air supply or flue
gas discharge?

Flue gas circulation, check flue
gas system for installation
faults and the heat exchanger
for possible leaks

Check SU board is correctly
inserted in the connector on the
PCU-01

Check the cable bundle

Remove external cause

Check the parameter

Check the cable bundle
C230 ECO-A