New to the forum so please be gentle! I'm yet another person having issues with my Biasi 24S combi boiler. Apologies too for the length of my first post!
In all honesty, I can't complain - since its installation in 1999, it's given me virtually trouble free heating and water. Until now, when it seems to have developed a mind of its own...
At first, it seemed I was having a problem with the timer switch as the grey slider had broken off and the heating would switch itself on and off even when the timer switch was in the ‘Off’ (middle) position. The dhw side worked as normal however and provided hot water as and when required.
I got a service manual from the Biasi website and with the help of my father (a time-served electrician of over 40 years), I removed the timer and fitted a push-latch switch using spade terminals into the timer connectors (no wiring has been cut), which meant that effectively there was no timer but the heating could be switched on and off manually as required, purely as a temporsry measure.
The dhw side has worked as normal throughout – the push switch served only to switch the heating on and off. This worked briefly but then one morning after having had the dhw running, the heating switched itself on again, even though the push switch was in the off position.
I also found out that after disconnecting the push switch (meaning no timer/push switch at all) to check whether this was the cause, the heating still worked, regardless of whether the switch was connected or not! I now have to switch the heating off using the summer/winter control knob when I don’t need the heating or hot water. I’ve also noticed that the ch temperature control doesn’t seem to have any effect on the temperature of the ch - it goes to 60 and keeps itself at that temperature.
The boiler has only previously had a new pump and dhw diaphragm as far as repairs go but has only (regrettably) had minimal servicing since installation.
Please help! I've come to the conclusion there may be a short on the pcb but don't want to go through the whole parts list in order to find out the cause of the problem so any advice would be greatly appreciated!
In all honesty, I can't complain - since its installation in 1999, it's given me virtually trouble free heating and water. Until now, when it seems to have developed a mind of its own...
At first, it seemed I was having a problem with the timer switch as the grey slider had broken off and the heating would switch itself on and off even when the timer switch was in the ‘Off’ (middle) position. The dhw side worked as normal however and provided hot water as and when required.
I got a service manual from the Biasi website and with the help of my father (a time-served electrician of over 40 years), I removed the timer and fitted a push-latch switch using spade terminals into the timer connectors (no wiring has been cut), which meant that effectively there was no timer but the heating could be switched on and off manually as required, purely as a temporsry measure.
The dhw side has worked as normal throughout – the push switch served only to switch the heating on and off. This worked briefly but then one morning after having had the dhw running, the heating switched itself on again, even though the push switch was in the off position.
I also found out that after disconnecting the push switch (meaning no timer/push switch at all) to check whether this was the cause, the heating still worked, regardless of whether the switch was connected or not! I now have to switch the heating off using the summer/winter control knob when I don’t need the heating or hot water. I’ve also noticed that the ch temperature control doesn’t seem to have any effect on the temperature of the ch - it goes to 60 and keeps itself at that temperature.
The boiler has only previously had a new pump and dhw diaphragm as far as repairs go but has only (regrettably) had minimal servicing since installation.
Please help! I've come to the conclusion there may be a short on the pcb but don't want to go through the whole parts list in order to find out the cause of the problem so any advice would be greatly appreciated!
