Alpha cb28 fan

[Andy Hilditch]

Is it a straightforward job changing a fan and motor on a cb28 boiler, diagnosis of the lights indicates it has failed.

 

[ianmcd]

Easiest fan I have ever changed

 

[ianmcd]

Dont take it for granted that it is the fan though, can you hear the fan running when it faults ?

 

[Andy Hilditch]

Dont take it for granted that it is the fan though, can you hear the fan running when it faults ?

No it doesnt start but has been quite noise lately. Had thepcb changed a couple of years ago but never a fan.

 

[Gasguru]

I think asking such a question rules you're not competent to replace it....very easy to end up with significant carbon monoxide.
Fault lights are just a guide, it may not be the fan....

 

[Andy Hilditch]

I think asking such a question rules you're not competent to replace it....very easy to end up with significant carbon monoxide.
Fault lights are just a guide, it may not be the fan....

Thanks , yeah calling Alpha tomorrow, fully aware of carbon monoxide thanks worked on large steam plants and nh3 all my life, just not domestic boilers hence asking advice . Very useful forum Gasguru.

 

[ianmcd]

When the CB range first came out there was a real problem with the bearings, would be very surprised if you still have an original fan, as they failed within months, if it does need a fan they are very easily replaced

 

[Gasguru]

The whole boiler's a pile of junk...compared to the previous models they are dire.

 

[ianmcd]

The whole boiler's a pile of junk...compared to the previous models they are dire.

Think was the first model to be made by Immergas, more leaks than a Welsh rugby game when you touched anything, newer ones a decent budget boiler but electronics are very iffy, to be fair when the CB range came out Alpha were the first to put their hands up that the fan bearings were shoite and done their best to get them sorted

 

[Gasguru]

The most unreliable DHW flowswitch ever made, themistors rubbish, diverter diaghragm total pain to remove (pump out makes it a little easier), leaks all around the diverter lower coupling and seized grub screws, combustion chamber seals bond themselves on, primary hex O rings leak for fun, early pcbs flakey etc. Give me an Alpha 240 any day.

 

[ianmcd]

Personally I think that the horseshoe flowswitch got a bad name because not many knew that it worked in reverse of any other switch, but maybe that is just me, I worked for Alpha and I could count on one hand how many flow switches I changed in that time, yep terrible for leaking and the grub screw was a mare, and needed a good weetabix pull to get the CC off

 

[Gasguru]

You must've been lucky...other Alpha contractors in the CC agree it's the worst DHW switch only seconded by the Turbomax flowswitch.

 

[durhamplumber]

"""have several house refurbishments lined up for this year and I won't be using Alpha again.
Terrible boilers.
Terrible engineers.
Terrible customer service."""
Rofl......made me chuckle!!!!

 

[ianmcd]

You must've been lucky...other Alpha contractors in the CC agree it's the worst DHW switch only seconded by the Turbomax flowswitch.

Agree with the turbomax ones changed a fair few of them, I found mostly with the Alpha ones that they work in reverse i.e. with the micro switch pushed in the switch is unmade and once it pops out then the switch makes, hence why if it is not located on the diverter valve properly, there is a constant demand for DHW or no signal when there was a demand as it was very easy to put the saddle switch back wrong after removing, not saying that other dint have faulty ones just my own experience, I still have a full bag of ten somewhere have had them for about 15 years I think