DOMUSA TEKNIK EVOLUTION EV 20 HFC, Installation And Operating Instructions Manual

Page: 23 / 48

21
11 SAFETY CUT-OUTS
The boiler’s electronic control system may activate the following safety cut-outs to stop the boiler
functioning. When one of these safety cut-outs occurs, the boiler will stop functioning, a cut-out code
will flash on the display and the red alarm warning pilot light will flash on the control panel.
If any of the safety cut-outs described below should occur repeatedly, switch off the boiler and call
your nearest official technical assistance service.
11.1 Temperature safety cut-out
When this cut-out occurs, the alarm code
“EAt”
(temperature
alarm) will begin to flash on the digital display
(11)
. The burner
will switch off and stop heating the installation.
This occurs when the boiler exceeds a temperature of 110 ºC.
To unblock it, wait until the boiler drops to below 100ºC and press the button on the safety
thermostat, located inside the boiler on the underside of the electrical box, after first having
removed the button cover.
11.2 Burner cut-out
When this cut-out occurs, the alarm code “EAQ” (burner alarm)
will begin to flash on the digital display
(11)
. The burner will
switch off and stop heating the installation.
This occurs as a result of an anomaly in the burner
(10)
or in the
fuel installation. To unblock it, press the illuminated button that lights up on the burner.
11.3 Low pressure cut-out
When this cut-out occurs, the alarm code “EAP” (pressure
alarm) will begin to flash on the digital display
(11)
. The burner
and the boiler circulation pumps will switch off, cutting off the
heating and water flow to the installation.
This occurs when the boiler pressure drops to below 0.5 bar,
preventing the boiler from functioning when the water is drained from the installation, due to
either leakage or maintenance operations. To unlock it, fill the installation again until a pressure of
1 - 1.5 bar appears on the “
boiler pressure
” setting on the display
(11)
.