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I did post another help there. I bought the multimeter from Argos last week. It costs £29.99. I don't think i have already damaged it.

Hi, Mathew, I did the test. But I get confused again. if you have a bit time, please help. Thanks so much.

yes. I also tested the votages between the three lines from main-power now. I just added the results above.

Hi, I tried to find where the neutral is broken. I disconnected the three main-power lines (one red supposed to be live, one black supposed to be neutral and the yellow/green supposed to be earth) on the FCU (the other three lines to boiler also are disconnected from FCU). I checked the voltage...

Hi, I have an open neutral problem within CU from the main-power supply to FCU (3A) to boiler. The voltgages of L(brown) and N(blue) on my boiler both appears as 238 v against earth. I tried to find where the neutral is open. I disconnected the three main-power lines (one red supposed to be...

repeated poster. i deleted it

I got a bit feeling the neutral breaking happened between the main-power supply and the FCU then the problem is beyond my ability to handle since the lines are hiddening in the wall. Months ago, we found at least three little mice in the house. Two were killed, one is still on the run but not...

It does make sense to find someone else who has the experience to do the job. You guys already have given me the most useful and helpful information I guess i am closing to solve the problem although i have already paid nealry £100 for the parts. I'll come back this weekend. Thank you so much...

I'll do more tests on weekend. I have some notes of my test which i did on weekend. This is the result when I disconnected the bioler and turn off the switch on/off with fuse spur. E: 129 (against bioler metal) N:87 (against bioler metal) L:87 (against bioler metal) The voltages of L, N...

Thanks for Mathew and Tom, All the voltages are against earth (yellow&green) which is connect to the metal part of the boiler in end. Do you mean even when the boiler is pointed to 'off' or doesn't work, the neutral volatage should still be 0? where do you think the broken could happen...

My old worcester 24 cdi/rsf boiler broke down another day. There is no light on at all, even the green one. According to the manual it suggests a failed pcb board. I bought a new one from ebay and a new transformer as well. I managed to replace the faulty pcb and the transformer according the...

Thanks. Do you mean the fault of the originally pcb board is due to broken neutral? How about the new pcb board I fitted in. The voltage test indicates the power is there.

I checked the voltage in fuse-spur and some other parts of the pcb board with a multimeter. Fuse spur in the kitchen downstairs: Brown the live to apliance: 238 Blue the neutral to appliance: 238 PCB upstairs: main-supply-in live:238 main-supply-in neutral: 238 Fuse one: 238...

repeated poster, i delete

Thanks. I know now and I'll try. I am not sure whether I even blow the new bought pcb due to my blunder try. It seems dorney1 only changed the fuse spur?

Dear Andygasman2010, could you please have a check of my problem. I get confused how you solved dorney's problem.

It seems I had the same problem as dorney once had but i don't understand how did dorney solved the problem. My old worcester 24 cdi/rsf boiler broke down another day. There is no light on at all. According to the manual it suggests a failed pcb board. I bought a new one from ebay and a new...