Baxi Solo 3 PFL Boiler question

dantheman2010

Hi all

I was just wondering what the LED lights sequence should look like during the whole process of the hot water being on?

I happened to look at the panel of the boiler before I went to bed last night and saw that the OVERHEAT LED was lit, I thought it was strange as the HW had only been on for 3 hours in the am and 1 hour in the pm. So I turned the dial to '0' waited 10 secs and turned it to where it was.

At 7am the HW came on timer, I woke up about 8am and felt the pipes in the airing cupboard and the HW pipe is hot to touch, I went downstairs to double check the panel and no LEDs are on at all despite the HW being on at the timer.

I turned on CH to constant (which is set to OFF at the mo) and BOILER, FAN, PILOT and BURNER all lit and the boiler was working. I turned the CH off leaving HW on but still no lights on the LEDs.

As I have never looked at what the LEDs do when the HW only is on I was wondering what the process is? When it first switches on in am or pm does the boiler, fan, pilot and burner all fire up to heat some water, when enough is heated then all turn off until the allotted HW is used then reheat some more providing the timer is still telling the HW to operate OR should the boiler, fan and/or pilot always be on whilst timer is on?

If they should always be on (whilst timer is) then why would they be fully working when CH is on but not when just HW is on? Why also would the system over heat on a total of 4 hours HW yesterday? I was wondering if the OVERHEAT was connected to no LEDs being on right now? I am unsure what happened LED wise when the HW first came on at 7am today as I wasnt watching it but usually first thing it does fire up, but as there are none on now I wasnt sure what should happen after the initial fire up (as I saw no LEDs some 1-1.5 hours after first fire up).

Yesterday a small amount of clear and cold water dribbled down from the back of the boiler and on to work surface below - however it was howling wind and rain at the time and there is slight gap in the sealant on the top of the flue outside and I put it down to that. I thought any water from the boiler wouldnt be totally clear and cold?

So many things have happened recently, not sure if the water was the rain and the overheat was all coincidence or is it all linked?

And I have a plumber scheduled to change the Honeywell 3 port motorized valve mid week (after the previous plumber let me down on two occassions). Could the problems be linked? (A refresher - when HW was coming on 1 single rad was being heated even though CH wasnt on - motor on valve was working - replacing valve altogether).

Boiler is 5 years old.

Thanks for any help.

gas4you

Just to take one point, the overheat light, this can sometimes appear to be on from the glow of the 'mains on' led next to it.

If it is actually on properly it will be very bright and distinctive.

The 'mains on' led also has a habit of flickering badly on these boilers.

dantheman2010

I cant see a "main on" led, but it was definitely the overheat led that was on.

What does normally happen with the LEDs for HW only? Do they all come on then all go off when enough water has been heated then come back as and when more HW is called for? Or should the boiler on and fan on stay on whilst the timer is on? If so why do they all operate correctly when I turn CH on, but then none stay on when CH switched off leaving HW on only?

HW was provided this morning when the timer was on though, as I said - the HW pipe was hot to touch, so something happened when it first came on. Just wondering what usual practice for the LEDs are once initial fire up and enough HW has heated but before timer for HW switches off.

Thanks

dantheman2010

Please can someone tell me if when the timer is on for HW, should the boiler LEDs be on the entire time?

I understand the process for CH and when I switch CH on it works perfectly but I really just need to know do the LEDs for bolier, fan, pilot and burner come on when HW first fires up and once it has heated enough they all switch off even if timer is on unless more HW is called for?

I cant find the process for the LEDs in the manual at all in relation to HW operation only.

I am hoping the OVERHEAT yesterday was just a blip/one off as we only had HW on timer for a total of 4 hours.

Thanks guys.

gas4you

'main led' = 'Power' led

The power led on the boiler, next to the over heat' should come on only when there is a demand for hw or heating. ie the programmer is on and the cyl stat or room stat says there is a need for heat.

The boiler is quite dumb and does not know whether it is a call for heat or hw, just a call to come on for something.

You may need to check your zone valve(s) as they will be what tells the boiler to come on.

Lgas

Just a thought, going back to your mid position valve problem, you say that only one rad was getting warm when the HW was on, it wasn't the bypass rad was it? (as in one that always heats up on purpose to circulate residual hot water in the boiler). Was it the bathroom rad? Strange that only one would heat up if the valve is passing.

When it first switches on in am or pm does the boiler, fan, pilot and burner all fire up to heat some water, when enough is heated then all turn off until the allotted HW is used then reheat some more providing the timer is still telling the HW to operate

Yes this is correct.

dantheman2010

Lgas wrote: »

Just a thought, going back to your mid position valve problem, you say that only one rad was getting warm when the HW was on, it wasn't the bypass rad was it? (as in one that always heats up on purpose to circulate residual hot water in the boiler). Was it the bathroom rad? Strange that only one would heat up if the valve is passing.



Yes this is correct.

Thank you. Sorry it was both the bathroom and the spare room ones which came on, but I just turned the spare TRV off, so now its only the bathroom one which comes on. Hopefully the new valve mid week will sort that issue.


Timer for HW came on a little while ago, all 4 leds came on, HW heated up then as per this morning all 4 went out after enough water had been heated, so all seems good, hoping the overheat was a one off. I will check to make sure it doesnt overheat again later.

Thanks guys