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Just to close this thread out. I changed the stat again and it resolved the issue. Stange Darren

Hmmmm......

So you think it might be a mcb that has gone faulty

Yes Terry in the outside box there a switch after the meter i think. If im going to be going that far i think id just get an electrician in to be safe.

Dunno if id mess with that to be honest might be a bit beyond my paygrade. Just a matter of isolate the supply to the board by turning off the red switches i guess

No just the heater, as far as i know anyway. We just notice that after putting it on the switch light is off in the kitchen after a bit. No electric heaters or shower pump installed, i'm trying to think of anything else that would affect it but i cant, every heavy users are on their on spurs

Thought it was wires but didnt want to presume. Just the one in there John

Lol, terryplumb id love to be able to tell you that but what do you mean "conductors" ? What are you thinking ? I have noticed that it take very little to flip this breaker manually when compared to the cooker one beside it. Clutching here at the minute

All switches look fresh, no charring of any sorts. Voltages when turned on: Immersion heat stat - live side to element side 240v. turn temperture arrow on stat to i hear a click and voltage to zero across the same. Voltage when off at wall: Zero

There's no timers, just an on n off switch in the kitchen another one that always on in the airing cupboard that has the flex to the immersion heater. I'll pull off the face plate on the wall switches to check though,maybe a bad connection in there thats causing excessive current to be drawn

Took the cover off, second one in from the right. B16 like you said

I have cunningly supplied a photo thats makes it impossible to see the words. Clearly states "IMM HEATER" There is no numbers just states "IMM HEATER" exactly like ive taken a photo of.

Its the one that says "immersion heater"

Guys, Anyone give me a little bit of advice before i call in the professionals. Background: Oil fired central heating 3 zones, upstairs, downstairs and water. Hotwater tank, x1 top down immersion heater. Oil fired heating and water works 100% Immersion heater doesnt ? What was happening...

Took me a bit to undsrstand your reply oilman but penny dropped eventually and its a fair point lol. I removed pump,ring filter cleaned out,wasnt that bad but probably needs replaced to be sure,photo lens removed and cleaned with rubbing alcohol,transformer HT connections buffed up,pump solenoid...

Ok, transformer is next port of call ? Is there a way to test them ? Still seems strange that all this came about about getting a fill of oil though.......going a good un before that it was

Sterling st40 with danfoss pump

In my previous post i mentioned about the coil that i put on being different to the one that i took off,would this make a difference ? It just seems to happen after initial start up in the morning say, after hitting reset it will run fine throughout the day if on and then once its been off over...

Yes,thats correct. Inline filter bowl was cleaned etc. Do you think its dirt in the pump filter ? You'd near think it was airlocking, like after running out of oil when it needs bled. Ive done this numerous times though. Just had it serviced to hoping the the engineer could identify the...

I have replaced the coil today and turned on the heating for upstairs, we have zonal heating, downstairs, upstairs and water. Burner fired up ran for approx 20 then locked out. Resetting using the button and burner will run fine again Happening more often than not now. Any other ideas what...