Fault Diagnosis - Ferroli Falcon 2

[vards01]

Hi I'm wondering if anyone would know what the following symptoms point to fault wise on my boiler Ferroli Falcon 2.

Its a combi boiler, the hot water thermostat has no effect it just comes out max temp......and the central heating system will not work, the boiler fires up then bangs and clunks a bit the pressure shoots up and the relief valve kicks in......lights then start flashing and you have to turn off and on again to get any functionality. The boiler is a about 10 years old now so dont relly want to pay expensive call outs etc for diagnosis if its a dead duck.

A friend of mine who is a plumber suggested it sounded like a main board fault......any advice much appreciated.

Thanks - Ian

 

[Murf520970]

Most heating engineers wont charge a fortune to look at it . It may be the pump not spinning , it certainly isnt the board. A competent heating guy will fix it easily enough

 

[vards01]

So what about the hotwater side of things......could this be another faulty component? Basically I did wonder if it was the pump as it hadn't been used all summer and last winter as I have a log burner, the novelty of the log burners wearing off so wanted it fixed for this year. Are the pumps serviceable?

 

[Murf520970]

the majority of combis run the pump for hw & ch . If it stops spinning the boiler overheats & pressure builds & then the pressure relief valve pops.

 

[picasso]

Not on this one, its got a twin pass heat exchanger, possibly the pump on the central heating and could be a faulty thermistor on the hot water, cheaper to fix than replace I reckon.

 

[Murf520970]

Its always the way Picasso , couldnt be bothered to check if it was a twin pass hx & it is . Oh well at least youve steered him in the right direction . Was thinking the hw thermistor as well

 

[Murf520970]

edit

 

[vards01]

Are the pumps serviceable on this model, I was thinking about rebuilding?

Also is this a good boiler, it was here when I moved in?

 

[ianmcd]

sorry but no the boiler you have is crap

 

[vards01]

I thought it might be.........I'll see how I get on with removing the pump.

 

[Agile]

The pump is only used on CH. It sounds like a jammed pump. See FAQ on how to unjam.

The DHW problem might be a faulty sensor. Needs resistance value measurement.

Tony

 

[vards01]

Hi thanks for the pointers about the pump......it was jammed up all working OK now. I have tested the resistance on the thermistor 11k when cold 3k when hot so seems to be working......the only other component I can think of is the variable resistor the control for DHW on the control pannel. Any ideas?

 

[Agile]

If the sensor is OK then that makes it more difficult to diagnose the problem.

It could be the PCB or gas valve settings.

Tony