Viessmann KK10 - Page 6

Operation
6
Diagnostics
Failure, Cause, Correction
Failure Cause Correction
Heating system does not activate
(only GREEN power LED is
illuminated)
Thermostat is not set to a
sufficiently high temperature
Adjust thermostat.
Heating system does not activate
(GREEN power LED is not
illuminated)
Power switch “ “ is in “ “
position
Ensure power switch “ “ is in “ “ position.
Main power to boiler control and
heating system has not been
activated
Activate main power; ensure 120 VAC is
supplied to control (receptacle).
Fuse on Vitotronic boiler control
has deactivated heating system
Replace fuse with same type and rating
(F1: T 6.3 A / 250 V, slow blow).
Burner does not activate, or
activates intermittently
(RED fault LED flashes)
Fixed high limit (FHL) tripped
Reset FHL by pushing in the pin, labelled with a
“ “ (using a ballpoint pen).
If a “click” can be heard, the limit was tripped.
If the limit requires multiple resets, please
contact your heating contractor immediately.
No fuel
*1
With oil: Ensure sufficient supply of oil
With gas:Open main gas supply valve
or
contact your local gas utility
Control calls for heat but burner
does not respond
*1
Attempt to reset burner using reset button on
the burner (underneath burner hood).
If still unsuccessful, please contact your heating
contractor.
Burner does not start Power venter (if installed) will not
activate or is defective
Contact your heating contractor.
*1
Red LED does not flash when Honeywell S8600 ignition control module is used with boiler.
5167 482 v1.2