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Hugh I had found that page during my searches. Interesting read.

TBH i had forgot there was other 2 reset switches on it. Sometimes the lock out light is on, sometimes it is not. But we have just got in the habit of hitting the lockout reset. The lockout light has not always been on when going to reset it so i guess that suggests the Fault conditions are...

The spring return valve fitted when the previous valve stopped working about 3 years ago - and i think it may have been a MOMO valve previously as i recall the same casing on it. We have had spurious trips over last couple years. It was very infrequently but last few months it has been occuring...

It is an Indirect system. Oil fired boiler in the garage with the supply split in the loft to the 2 actuated zone valves. Central heating circuit has a header tank in the loft. Hot water cylinder is as ianmcd guessed = unvented. Could the configuration of 1 MOMO and 1 Spring return valve...

Hi there everyone. I am currently trying to trace through and fault find issues with my central heating / hot water system. First off i have been confirming Zone valves actuator are operating correctly. Central Heating Zone valve is Sunvic SZM 1801 Hot water zone valve is a honey well 272848...