Truma boiler problem

[Billkiz]

My Truma combo boiler keeps coming back on after I have turned it off.

[rayc]

1 hour ago, Billkiz said:

My Truma combo boiler keeps coming back on after I have turned it off.

Do you mean it comes back on and carries on as before you turned it off or is it just going through its cool down procedure? 

[Derek Uzzell]

The 'cool down' procedure is touched on in the Combi Operating Instructions that say

Switching off

– Switch the heater off on the control panel.

– The switch-off procedure may be delayed by several minutes because of internal heater operations. 

A fuller explanation is provided here

https://www.truma.com/uk/en/faq/circulating-air-motor-trumatic-c#:~:text=the FAQ overview-,Why does the circulating air motor keep running after the,during the after-run period.

Why does the circulating air motor keep running when the Truma Combi heater is switched off?

This function protects the Combi heater from possible overheating caused by heat build-up. The circulating air motor gives off the possible heat build-up into the vehicle interior during the after-run period. The after-run is activated every time the system is switched off, even if the Truma Combi heater was only switched on for a short time. You cannot deactivate the fan after-run.