Operating instructions

Checking the thermocou ple
If the burner control unit cannot be
reset after a fault shutdown, although
the boiler water temperature is below
approx. 90 °C:
&
Pull the leads from
thermocouple A.
&
Check the continuity of the thermo-
couple with a multimeter.
&
Remove the faulty th ermocouple.
&
Install a new thermocouple.
&
After commissioning, press reset
button E on the control uni t.
Checking and replacing pressure differential sensor
Check the sensor in case of fault messages concerning the differential pressure
sensor:
&
correct instal lation
&
electrical co nnection
&
correct posit ion of the O-ri ngs inside the ad aptor
&
are the test nipples closed with plugs?
Replace the sen sor if fault mess ages persist.
Repairs (cont.)
90
Troubleshooting
5692 548 GB