Tetan KP 12-ES, Service And Operation Manual

Page: 64 / 80

Automatic boiler for wood pellets
63
Error states
9.4 ERROR - OVERHEATING, EMERGENCY THERMOSTAT
The control unit is equipped with emergency circuit in case of overheating of the boiler. OVERHEATING fault
condition occurs when the water temperature at the outlet exceeds a threshold of 95 ° C. In this situation, the
emergency circuit is activated by the control unit and the boiler is shut down.
This is indicated by the lighting up of this red box:
Only circulating pump is put into operation for heat dissipation of the heat exchanger.
Under normal circumstances, there is no overheating of the boiler, so this condition is considered an emergency.
It requires operator intervention (service), which must evaluate why this situation occurred.
Possible causes Elimination Performed by
The boiler water temperature is
set to a high value
(around 90 ° C)
Reduce output water temperature (Menu 2) to f.e.
80 ° C.
user
Insufficient heat dissipation from
the boiler
- circulation pump not running
Control of the circulation pump, or switching to
higher power.
user
- blocked cleaning strainer Close the valves and clean the strainer. installer
- wrong hydraulice of heating
circuit (all thermoheads
closed)
Check the temperature during Stand – by mode and
set a longer period of time
installer
Too short Stand - by time of the
boiler without electric ignition
ExtendStand – by parameter (in the Menu Service) service
Larger amount of unburned
pellets in the combustion
chamber
Carefully clean the burner chamber and
professionally set the combustion.
service