I've recently experienced multiple boiler faults/breakdowns - luckily I have a maintenance contract - but after several suspect components were replaced without success I was advised to replace the FCU serving the system.
Having done this I still find that the boiler runs normally for about 20 minutes and cuts-out.
One thing I did notice when removing the old FCU was that the neutral on the load side (N - out) had in fact been connected to the supply side (N - in). So, both supply and load neutrals share the same connection.
Whilst the heating system had been running normally prior to the recent boiler problems - and with the neutral connections as decribed above - is there any likelihood that this could cause sensitive items, e.g. circuit boards to react and bring about a shut-down? The pcb was replaced about a year ago with an upgraded version - thinking this was faulty it was replaced again without success.
Having done this I still find that the boiler runs normally for about 20 minutes and cuts-out.
One thing I did notice when removing the old FCU was that the neutral on the load side (N - out) had in fact been connected to the supply side (N - in). So, both supply and load neutrals share the same connection.
Whilst the heating system had been running normally prior to the recent boiler problems - and with the neutral connections as decribed above - is there any likelihood that this could cause sensitive items, e.g. circuit boards to react and bring about a shut-down? The pcb was replaced about a year ago with an upgraded version - thinking this was faulty it was replaced again without success.
