baxi combi boiler 105e

[seanmfc]

hi all the above boiler is not comming on the fuse is ok there is no power getting to the boiler the book says its the pcb is this right or could it be something else

thanks

 

[kevplumb]

check the fuse at the terminal block at the boiler 2A fast blow

 

[seanmfc]

just checked that it looks blown to me the glass is all black thanks for your help

 

[namsag]

usually the pump or fan that causes this fuse to blow, has it been running dry.

 

[seanmfc]

it has been running slightly under the minimum line never dry when putting a new fuse in then turning the water on it blows straight away

there is power to the pcb and the troubleshooting says the pump supply cable needs to be replaced the pump turns as well

im lost

 

[namsag]

DIY way of checking.
Disconnect the pump an isolate the wire safely. turn on and see if it still blows if not .
Then activate manually the microswitch on top (not front)of the divertor valve this will bring the fan on if fuse does not blow then it would strongly suggest pump

 

[seanmfc]

we have disconected the pump wire then doing the switch on the diverter nothing happens there seems to be no power there

 

[kevplumb]

when putting a new fuse in then turning the water on it blows straight away

not having a poke you did replace the fuse

 

[seanmfc]

yes the fuse was replaced the green light for on is on

 

[namsag]

Sorry meant to put, set it so heating is being demanded

 

[seanmfc]

the heating worked when we done what you said

 

[namsag]

You mean fan came on and fuse did not blow, with pump disconnected then this suggests pump is your problem.
Grundfos 15/60 just change the head , you maybe able to buy head seperatly but if not just split it from the body by undoing the screws

 

[seanmfc]

thanks to people involved in helping me to solve this problem fitted a new pump and bingo all working fine

thanks once again

sean

 

[namsag]

Not a bad guess i might take this game up for a living.

 

[kevplumb]