Recent content by ianyork

OK so I think we have solved the problem. There were actually two issues that we've identified. The first is that there was a dodgy relay in the HC60NG. Honeywell supplied a replacement that simply substituted for the existing removable unit. That changed the behaviour of the system...

We'll resort to manually switching off at the boiler rather than using the controllers when the heating is off, because otherwise the boiler fires every 10 minutes for a minute as if it were stuck performing the TPI hysteresis convergence process. Here's the process for resetting the...

Thanks for the fast reply. (a) Exactly - the heating is turned off at the control unit (b) More than 10 degrees. The controller is set to 5C and thermometers read 19C. The cycling only occurs during the "rest" periods when there's no demand from the thermostat. If the rooms are heating up...

Hi guys, I have the same behaviour from the system even when there's no demand: while the temperature is falling or the heating is set lower than the ambient temperature the 10 minute cycle still happens. Is that a cause for calling out the installer? Cheers, Ian