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15 Alarms descriptions
Alarm numbers displayed on the eSTER_x40
wireless room thermostat.
Boiler max. temp. exceeding
Burner max. temp. exceeding
Boiler temp. sensor damage
Feeder temp. sensor damage
Overheating boiler, STB open contact
15.1 Boiler max. temp. exceeding
Protection against boiler overheating is done
in 2 steps. In the first step, after exceeding
Boiler cooling temp. the controller tries to
reduce boiler temperature by dropping
excess of heat to the HUW tank and by
opening mixer servomotors (only when Mixer
support = CH ON). If temperature measured
by HW sensor exceeds value Max. HUW
temp. then HUW pump is deactivated, what
is done to protect users against scalding. If
boiler temperature decreases, then the
controller returns to normal operation. If the
temperature will still increase (reaches 95ºC)
then constant alarm will be activated of
boiler overheating joined with sound signal.
The alarm can be deleted by alarm
confirmation or activating and deactivating
power to the controller.
Locating temperature sensor
outside water coat of burner i.e. on
exhaust pipe is not beneficial,
because it may cause delay in
detecting boiler overheating state!
15.2 Burner max. temp. exceeding
Alarm appears after exceeding feeder
temperature above service parameter Max.
burner temp. If the burner temperature
increases above this value the controller will
begin burning off procedure.
The alarm can be deleted by alarm
confirmation or activating and deactivating
power to the controller.
15.3 Boiler temp. sensor damage
Alarm appears by boiler sensor damage and
by exceeding measuring scope of this sensor.
When alarm appears the boiler is activated.
The sensor is to be checked and replaced if
necessary.
The alarm can be deleted by alarm
confirmation or activating and deactivating
power to the controller.
Checking the temperature sensor is
described in point 12.8
15.4 Feeder temp. sensor damage
Alarm appears when feeder sensor is
damaged or by exceeding measuring scope
of this sensor. After alarm the boiler is burnt
off. It is necessary to check the sensor and
replace it if necessary.
The alarm can be deleted by alarm
confirmation or activating and deactivating
power to the controller.
Checking the temperature sensor is
described in point 12.8
15.5 Overheating boiler, STB open
contact
This alarm occurs after activation of
independent safety thermostat that secures
the boiler against overheating. The burner
will then be deactivated. After the boiler
temperature will drop down it is required to
unscrew an oval STB lid and then press the
Reset button, point 12.15
15.6 Firing up failed attempt
Alarm will appear after third failed attempt of
automatic furnace firing up. In case of alarm
all pumps are deactivated in order to not
cause excessive cooling of the boiler.
Deleting is done by activating or deactivating
the controller. The cause of these alarms can
be broken igniter or lack of fuel in the silo.
16 Additional functions
16.1 Power stoppage
In case of power stoppage the controller
returns to operation mode in which it was
before stoppage.
16.2 Antifreezing protection
When temperature of the boiler decreases
below 5ºC CH pump will be activated
enforcing circulation of boiler water. It will
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