DeDietrich Elitec DTG 1304 Eco.NOx/V Technical Instructions page 23

Checking the anti-smoke release thermostat
In the event of smoke release by the anti-blowback device, the anti-
release safety device switches off the burner with the safety box on
standby for 15 minutes (this is indicated by an alarm indicator
flashing).
Checking procedure :
Turn of the heater and take out the smoke duct linking the heater to
the chimney. Close off the smoke duct to the heater using a metal
sheet (or other heat proof material).
On start up, combustion products are evacuated to the back of the
heater by the anti-blowback device opening inside.
The anti-blowback thermostat triggers for a few seconds, cuts the
burner and starts the safety box timer (alarm indicator flashing).
After checking, re-assemble the smoke duct connecting the heater to
the chimney.
Wait for about 5 minutes (thermostat cooling time) the cut and
reconnect the current using the Start/Stop switch. The boiler restarts.
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23/06/05 - 300002940-001B DTG 1300 Eco.NOx/V