Troubleshooting
43
Correction (continued)
Check safety fixed high limits (FHL)
If the safety fixed high limits cannot be
reset after an automatic lockout of the
burner control unit, even though the
boiler water temperature is below
approx. 194 ºF/90 ºC, perform the
following steps:
H Disconnect the cables from the fixed
high limit switch A.
H Check continuity of the fixed high
limit switch with a multimeter.
H Remove defective limit switch.
H Coat new limit switch with heat
conductive paste and install.
H After start-up, press the reset button
”EU” on the control unit.
Check fuse
1. Disconnect connector fÖ A in the
control unit.
2. Remove fuse F3 (6.3 A) B by
holding its grip and pulling out of the
base.
3. Check continuity of fuse with a
multimeter.
Check thermostatic radiator valves
Check operation and setting.
The thermostatic radiator valves must
not be activated in a room in which the
room temperature sensor is installed for
room temperature dependent operation.
In case of a weather-responsive control,
with a room temperature sensor via the
RS remote control unit, keep the
thermostatic radiator valves fully open.
5285 961 v1.3
A
AB
IMPORTANT
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