Winterwarm DXC Series, Installation Manual

21

INSTALLATION MANUAL 

AIR HEATER TYPE DXC

9.4  Instructions

After identifying the problem, use the Case number to find 
the possible cause in this paragraph.

Case 1:

 Flame lasts only 5 seconds after ignition.

•  The flame is not detected:

–

Check the ignition/ionisation cable and the 
electrode. The cable should have a resistance 
of 1 kΩ.

•  The air heater is not earthed properly.
•  The circuit board is defective.

Case 2: 

No flame after ignition.

•  There is not enough gas pressure.
•  The gas mixture is too poor:

–

Adjust the gas valve (see §8.1).

•  The gas valve does not open:

–

During ignition, check for a 230 V voltage on 
the valve.

•  Check if the ignition electrode sparks. If not:

–

Check the cable and electrode and replace 
them when damaged.

–

Check the burner control unit and replace it 
when it does not give a spark output.

Case 3:

 Heat exchange sensor or flue sensor is overheated.

•  Check if the connectors J12 and J6 are plugged in 

correctly and if the connection J12[1-4] (optional 
overheating protection) is closed.

•  Check if the system fan supplies enough air.
•  Check the settings of the gas valve. The heater may 

be overfired. If so:

–

Adjust the burner pressure.

Case 4:

 Heat exchange sensor or flue sensor not detected, 

or short circuit.

 NOTICE 

 L-25 refers to the heat exchange sensor. L-26 

refers to the flue sensor, if applicable.

•  The heat exchange sensor consists of two internal 

sensors. The readings of these sensors may differ 
too much:

–

Measure the resistance of each sensor. The 
resistance should be 20 KΩ at 25 °C and 25 
KΩ at 20 °C.

–

If the measured values differ too much, 
replace the sensor.

Case 5:

 Too many flame failures while burning.

•  The gas supply is not constant. This results in a 

drop in gas supply pressure while burning and 
causes the flame to extinguish.

–

Check the gas supply pressure while the 
heater is burning.

•  The burner pressure for Low fire is too low. This 

causes the flame to extinguish because it is too 
small to be detected.

–

Check the burner pressure at Low fire and 
adjust if necessary (see §8.1).

•  Recirculation of flue gas. Due to a problem with the 

flue terminal the flue gas is sucked back into the air 
inlet. This results into a lack of oxygen and causes 
the flame to stop.

–

Check the flue system and fresh air supply. 
Only certified, original parts should be used.

Case 9: 

Too many reset actions in a short timespan.

•  This error will disappear after some time or if the 

main power is disconnected for a while.

Case 11:

 Insufficient air passage through the heat 

exchanger. Pressure switch does not close.

•  Check if the combustion fan is running.
•  Check if the flue system is blocked or restricted.
•  Check the pressure switch and the connections.
•  Check the heat exchanger for flue leakage.

Case 12:

 E-error for more than 24 hours.

•  Switch the air heater off and on and check the error 

code.

Case 13:

 Internal error.

•  Isolate the electrical supply and reenergise. If this 

does not help:

–

Replace the burner control unit.

Case 14:

 Pressure switch is closed in stand-by mode.

•  Check if the contact is stuck. If so:

–

Replace the pressure switch.

•  Check if there is water in the hose. If so:

–

Dry the hose.

Case 15:

 Flame detected after closing the gas valve.

•  Check if the gas valve closes too slow. If so:

–

Replace the gas valve.

•  Check if the ionisation electrode is wet. If so:

–

Dry, clean or replace the electrode.