What would you say fails most frequently in a combi boiler?

[Mark-519]

- gas valve?
- gas pressure too low?
- control board?
- heat sensors?
- overheat thermostat?
- air pressure switch?
- ignition/spark generator?
- flame sensor?
- heat exchanger?

 

[Barry98]

operator understanding ?

 

[Plumbstar Tom]

the (cowboy) install?

 

[GQuigley67]

the pressure lol and the persons lack of knowledge on how to top it back up

 

[villa_tom]

I would say water pressure loss. I am seeing lots and lots of minor leaks on the inside of combi's lately and where I worked before we looked after alot of Worcester's and they leaked internally all the time. The washer on new combi's are rubbish

 

[danielp]

the flue falling off or the plate heat exachanger and diverter

 

[Billy Bob Bob]

plate heat exchangers trough blocking with crud,aps (the weakest part of any combi),diverter valves thermistors ev and prv,pcbs on certain boilers ,diaprahms if fitted and of course leaking internally due to high temperatures

 

[SimonG]

On the oil ones:-
Customer not topping pressure back up - low pressure switch - screaming pumps
Flow switch
3 Port Valve Head
Danfoss Coil
Expansion Vessels
Pump

 

[Alpha man]

Anything and everything depending on what combi you've got!!

 

[quality]

Ferolli

 

[stevetheplumber]

most reliable part is the side panels ive never had one fail

 

[Billy Bob Bob]

Ferolli

or ideal lol if its a ideal put a Axe trough it

 

[SafeGasInstall]

customers with more then one shower

 

[REDSAW]

gas credit

 

[Reg Man]

Diverter valves, then plate heat exchangers for materials.

Combis fitted where they can't meet the household demand for design.

Non compliant installs for workmanship.

 

[Puddle]

poll added

on a clean system going for thermistors/sensors

 

[Dannypipe]

I'll go then,

APS goes pretty often. I'll say that methinks!

 

[Alpha man]

Other for me, hw flow switches or diaphragms!