MAIN 30 HE not firing up (plz Help)

[psk]

Hello everyone,

I will be quick on the point. I have a Main HE30 open vent boiler that wont fire up at all.
It is a brand new install and i cant commision it as it wont fire up at all. I have checked all my electrics and i am getting 240v at the switch live
but nothing shows after that. The pump does not operate on switch live but runs if you give it live. that indicates pump is ok
I got main to send their engineer out he was there for 10 mins changed the pcb and still the boiler did not fire up.
I am baffled and cant seem to get my head around this problem. I will appreciate if you could please guide me through this problem.
My initial thoughts were the pcb but thats been ruled out and i have asked main to send in another enginner to check the boiler out but i am curious to know what the problem can be.

Thanks for reading and helping out.

 

[woodsy]

What happened to the Main engineer when it still didn't work ?

 

[psk]

What happened to the Main engineer when it still didn't work ?

The guy was in such a rush he spent 10 mins fir in a new pcb the boiler didnt work and he blamed me wrong wiring. I argued with him that i have installed over 10 of these this year all same electrics so what is he talking about. I mean if it reverse polarity the pump should atleast work and there should be some action in the pcb but the thing is dead like a dino

 

[bill577]

Do you have 240 at the live/neutral connection and 240 on the live to earth ?

 

[stevetheplumber]

i once commisioned 12 boilers and managed to reverse polarity on one its easy done go back and do your basic electrical tests again

 

[Billy Bob Bob]

i agree with steve but try looping the flow switch see if it fires if it does weak pump or faulty flow switch

 

[Puddle]

To be differant, will go for a faulty selector switch,had two :freak: ...

 

[gasmarc]

I would remove your wiring from the boiler or wire it direct , this will prove the fault lies with the boiler, you may find the boiler has not been wired correctly which i have seen a few times or a link ommited. Do you not need a permanent live and a switch live or is there not a reset button or an open circuit on pressure switch or loose connector or duff thermistor perhaps

 

[Billy Bob Bob]

I would remove your wiring from the boiler or wire it direct , this will prove the fault lies with the boiler, you may find the boiler has not been wired correctly which i have seen a few times or a link ommited. Do you not need a permanent live and a switch live or is there not a reset button or an open circuit on pressure switch or loose connector or duff thermistor perhaps

no permanent live required to this boiler quite hard to get the wiring wrong

 

[matmate]

had one like that.was the thermistor.very cheap and easy to replace.good luck

 

[armourer]

I would just put a direct earth, neutral and permanent live to the switched live and if it doesn't fire up throw it back to main and dont worry about it.

If you are still that interested tell the customer to call you when the main engineer arrives and go back to see what it was.

 

[gasmarc]

I agree with above good idea .i have seen a batch of boilers wired wrong on the pcb and the customer was just about to buy his THIRD new boiler and i sussed the problem

 

[psk]

HI All,

Thanks for your input, i appreciate it sorry for the late reply though.

Engineer's in tomorrow lets see what this one says, i will try wiring the boiler direct and check if it fires up. The pump does not work on switch live but works on direct.So here i got a pump that works on direct current but nothing happens thereafter. I just got a feeling the whole damn things messed up.
Fingers crossed for tomorrows visit by Main.

I will keep you guys updated.
Cheers

 

[psk]

Hi!

I havnt been on this forum for nearly a week......felt homesick!
As my original post it turned out to be my fault for not getting all the neutrals together at the junction.
It looked pretty simple when the neutrals were joined together and the boiler fired up,before thyat all sorts of things were jumping in my mind.
conclusion......look at your wiring first.i guess i need a wiring course. any ideas where i can get some help.
cheers

 

[gasmarc]

Honeywell do them , but saying that you never stop learning , My mate who has been doing boilers etc for twenty years managed to wire a boiler wrong on my job putting the switch live where the permanent live should be , At the time i was convinced it was a zone valve issue and ended up going through everything with a fine tooth comb and spent ages before sussing the problem , That was a lesson and a half I can guarantee you