Baxi Boiler Problem - Advice

sawdox · 09-11-2009, 07:36

Hi - I've got a Baxi Combi 105 HE. This morning it came on as usual but only for 5 mins and then stopped working. Now the 30 and 50 degree temperature lights are flashing and I've got no hot water or heating. Any help out there please?

Andykel · 09-11-2009, 08:32

When you switch on the demand for heating or when you run a tap, what happens? Does the boiler make any efforts to start up? Noises etc?

sawdox · 09-11-2009, 09:19

It starts making the usual noise for about 5 secs but then cuts out.

seacam · 09-11-2009, 09:35

Quote:

Originally Posted by sawdox

It starts making the usual noise for about 5 secs but then cuts out.

Hello,

Is the system pressurized, what does your gauge read, it should be half way between 1 and 2.

sawdox · 09-11-2009, 09:37

Yeah - it's at 1.5 and I did a reset but no luck.

seacam · 09-11-2009, 10:56

Quote:

Originally Posted by sawdox

Yeah - it's at 1.5 and I did a reset but no luck.

Hi sawdox,

Ok,

Fan Faulty,

Blocked Venturi, ( might need replacing, they can warp. ),

Faulty air pressure switch.

Faulty boiler thermistor.

How old and when was it last serviced?

sawdox · 09-11-2009, 11:16

It's about 2 and a half years old but it's never been serviced!

seacam · 09-11-2009, 11:38

Quote:

Originally Posted by sawdox

It's about 2 and a half years old but it's never been serviced!

So it's the 105 E Instant you have, same faults affect both versions of the 105 and quite common.

It's any of the three faults I stated, probably not a blocked venturi in this instance.

Other things will be the inevitable faulty PCB,---no hang on you have flashing temperature light,---no its a faulty fan or APS.

If your boiler replaced another one and was paired to an older system and that system wasn't cleaned and flushed, once the boiler is up and running, it would be a good time to have the system de-sludged and flushed.

sawdox · 09-11-2009, 11:58

Ok thanks - I'll see what the engineer says.

seacam · 09-11-2009, 12:18

Quote:

Originally Posted by sawdox

Ok thanks - I'll see what the engineer says.

No worries, let us know how it goes.

sawdox · 09-11-2009, 13:05

Whatever it turns out to be, it doesn't say much that it has only lasted for a couple of years!

seacam · 09-11-2009, 13:41

Quote:

Originally Posted by sawdox

Whatever it turns out to be, it doesn't say much that it has only lasted for a couple of years!

Yes I agree sawdox, but like some other units/brands, some Ideal, some Potterton and of course the 105E, a premature failure of a part is guaranteed.

When the 105E is installed as part of a complete new system, I mean the works, they fair so much better IMO.

It's when they are paired to an older system, if that system is not cleaned or flushed, that's when problems occur with the 105E and others IMO.

That's not a rule of thumb of course but my experience.

Fortunately 105Es are dead easy to repair, not to bad on parts either, which is a good thing judging by the failure rates of these units.

But if the 105E is well serviced, they do the Job.

Welcome to the world of the 105E and Instant

sawdox · 09-11-2009, 14:05

Just spoke to my installer. Going off my description of the flashing lights (which may not have been very good), he reckons it is either the pressure switch (£80) or the pcb(£160). Also commented on why I haven't had it serviced! Would a service have picked up the fault?

seacam · 09-11-2009, 14:57

Quote:

Originally Posted by sawdox

Just spoke to my installer. Going off my description of the flashing lights (which may not have been very good), he reckons it is either the pressure switch (£80) or the pcb(£160). Also commented on why I haven't had it serviced! Would a service have picked up the fault?

Hi sawdox,

A service helps alleviate problems not necessarily pick up on them, so no is the answer.

In other words unless there are symptoms or an engineer picks up on what he is being told coupled with a healthy dose of experience, a service can't usually pick up on the premature failing of a part.

I think your installer is wrong about the PCB in this instance, on the Baxi, like Potterton they are renowned for failing sometimes within a few months of installing the boiler, ( 14 to 16 months is the average ) but they have got a little better, not much but better.

Although I mentioned the PCB earlier I didn't really include it in my list, unusual I'll admit when I'm dealing with a Baxi thread.

Because you have a flashing temperature light, that indicates to me those things I said in my other post.

It could be a faulty PCB,-------but I don't think so,---not in this instance.

Fan or pressure switch at a guess or both and a couple of other things before replacing the PCB.

Edit,

Get your installer to introduce some de-sludger while he is there, leave it in for three weeks, get him to come back to flush system or one of us here will tell you how to do it, not hard but can be a long job.

seacam · 09-11-2009, 16:19

Hi Sawdox,

Get him to check the flue as well.

sawdox · 10-11-2009, 09:52

Ok, he came out last night and said he thinks it's the pcb. He fitted a new pcb (£148) but doesn't want paid until it's worked for a few days to make sure that was the fault. Fair enough.
He aslo reckons I should get it serviced - £87 for a service including free parts and labour for the next 12 months. That sounds like an ok deal to me. What do you reckon Seacam?

seacam · 10-11-2009, 12:21

Quote:

Originally Posted by sawdox

Ok, he came out last night and said he thinks it's the pcb. He fitted a new pcb (£148) but doesn't want paid until it's worked for a few days to make sure that was the fault. Fair enough.
He aslo reckons I should get it serviced - £87 for a service including free parts and labour for the next 12 months. That sounds like an ok deal to me. What do you reckon Seacam?

What a nice engineer but he doesn't know if the PCB is at fault,---- although I do realize PCB faults can be hit and miss affair.

Flashing temperature warnings and it's the PCB, not my first suspect in this instance I have to admit.

Is your system working and behaving its self?

£87-00 for a full 12 months of service including parts and labour???, did you get him to introduce some chemical cleaner while he was there? as he has got to come back if he is to do your service.

What does the service include this time around?

sawdox · 10-11-2009, 13:11

The system worked ok last night when he put it on and again this morning when it came on timed. He said to give it a couple of days to make sure. Didn't ask about the cleaner - could get him to do that when he services it.
Not sure what is involved in the service! But he did say that if I'd had it serviced last week then this repair would have been free!

seacam · 11-11-2009, 00:26

Quote:

Originally Posted by sawdox

The system worked ok last night when he put it on and again this morning when it came on timed. He said to give it a couple of days to make sure. Didn't ask about the cleaner - could get him to do that when he services it.
Not sure what is involved in the service! But he did say that if I'd had it serviced last week then this repair would have been free!

Hi Sawdox,

£87 is very cheap.

As you engineer said, give it a couple of days, hopefully that's the problem sorted for you.

You need to ask him what the service contract includes, get in in writing.

I think having the system cleaned and flushed may in the future pay dividends for you.

09-11-2009, 07:36	#1
sawdox Forum Member Join Date: Sep 2008 Posts: 76	Baxi Boiler Problem Hi - I've got a Baxi Combi 105 HE. This morning it came on as usual but only for 5 mins and then stopped working. Now the 30 and 50 degree temperature lights are flashing and I've got no hot water or heating. Any help out there please?

09-11-2009, 08:32	#2
Andykel Forum Member Join Date: Oct 2009 Posts: 34	When you switch on the demand for heating or when you run a tap, what happens? Does the boiler make any efforts to start up? Noises etc?

09-11-2009, 09:19	#3
sawdox Forum Member Join Date: Sep 2008 Posts: 76	It starts making the usual noise for about 5 secs but then cuts out.

09-11-2009, 09:37	#5
sawdox Forum Member Join Date: Sep 2008 Posts: 76	Yeah - it's at 1.5 and I did a reset but no luck.

09-11-2009, 11:16	#7
sawdox Forum Member Join Date: Sep 2008 Posts: 76	It's about 2 and a half years old but it's never been serviced!

09-11-2009, 11:58	#9
sawdox Forum Member Join Date: Sep 2008 Posts: 76	Ok thanks - I'll see what the engineer says.

09-11-2009, 13:05	#11
sawdox Forum Member Join Date: Sep 2008 Posts: 76	Whatever it turns out to be, it doesn't say much that it has only lasted for a couple of years!

09-11-2009, 14:05	#13
sawdox Forum Member Join Date: Sep 2008 Posts: 76	Just spoke to my installer. Going off my description of the flashing lights (which may not have been very good), he reckons it is either the pressure switch (£80) or the pcb(£160). Also commented on why I haven't had it serviced! Would a service have picked up the fault?

09-11-2009, 16:19	#15
seacam Forum Member Join Date: Oct 2005 Posts: 6,793	Hi Sawdox, Get him to check the flue as well.

10-11-2009, 09:52	#16
sawdox Forum Member Join Date: Sep 2008 Posts: 76	Ok, he came out last night and said he thinks it's the pcb. He fitted a new pcb (£148) but doesn't want paid until it's worked for a few days to make sure that was the fault. Fair enough. He aslo reckons I should get it serviced - £87 for a service including free parts and labour for the next 12 months. That sounds like an ok deal to me. What do you reckon Seacam?

10-11-2009, 13:11	#18
sawdox Forum Member Join Date: Sep 2008 Posts: 76	The system worked ok last night when he put it on and again this morning when it came on timed. He said to give it a couple of days to make sure. Didn't ask about the cleaner - could get him to do that when he services it. Not sure what is involved in the service! But he did say that if I'd had it serviced last week then this repair would have been free!