6.12 Pump blockage protection
6.13 Check the discharge safety devices
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(only for …-3 MFK boilers)
Pay attention: the boiler must remain energized.
The boiler is fitted with two discharge safety devices.
If disturbances A4 or A2 are displayed frequently, call your installer or the
JUNKERS after-sales service. Chimney operation needs improvement, or the
boiler needs servicing.
.
Each pump trip is followed by a timer, in order to run the pump briefly – every
24 hours.
After about 20 minutes, the boiler switches back on automatically.
The backflow safety on the combustion chamber trips the boiler if flue gases
escape from the combustion chamber. Disturbance A2 is displayed.
This function prevents blocking of the circulator after a prolonged
stoppage period.
The display shows
The backflow safety device on the backflow preventer trips the boiler if flue
gases flow back through the backflow preventer into the installation location.
Disturbance A4 is displayed.
6 720 660 245 (2015/06 BL-FR)
Machine Translated by Google
