PWM Improvement: keeping CH enabled while lowering t_set to keep pump running

[adipierro]

Hi! My Baxi boiler turns off the pump shortly after central heating is disabled. Although the boiler has post-heating pump over-run config parameter, its timer is reset once CH is toggled, possibly due to a bug.

Sometimes this causes the boiler to overheat as the circulation stops too early, especially if just 1 or 2 TRVs are open, and if PWM is not in a 'PWM_SHORT' status...

What if we implemented a configurable option for keeping ch_enable on if any valve is open, but setting just the t_set to 10°C, making the boiler to stop heating; during the PWM cycle in off phase?

[sergeantd83]

This is a unique boiler operation. We’ve never faced such a behavior. Maybe your boiler brand needs this special “treatment” since this issues has never been reported before.