Warmflow oil boiler tripping

[Rozie]

Hi we have a Warmflow Kabin Pak Combi 70/90 and the High Limit thermostat is tripping at the first firing and then several times through the day when the hot water is selected. Offtec engineer seems unsure why, any suggestions please.

The central heating seems okay.

All the googling I have been doing I feel as though I could soon be an expert :teeth_smile:

 

[WHPES]

Hard to tell without looking. Could be several things, just got to use a process of elimination. My first things to check would be the control thermostat and then the high limit thermostat. Try putting new ones in and see of the problem solves itself

 

[Rozie]

Thanks for your reply we wondered about replacing the high limit thermostat. The boiler is doing strange things today as well, now the hot water is warming up even though we have turned it off on the timer. It is warming up when just the central heating is on. At least we have heat and water.

 

[WHPES]

Could be a dodgy flow switch

 

[Rozie]

Ah that's one of the things we hadn't considered I will get my trusty and well thumbed manual out and have a look. Don't worry we will not be attempting to fix ourselves but we want to have a list of questions when next we meet up with our busy plumber who is floundering, oil boilers do seem to pose more problems than gas, I wish we had stuck to our back boiler on the woodburner it was less complicated we thought with an oil boiler we would always have heat and water when we were too old to saw up wood.

 

[WHPES]

You may be best to ask another engineer if your first guy doesn't know.

I take it he's already asked Warmflow tech support for help? Sometimes its the easiest way to fix a problem.

 

[Rozie]

Thanks wipes I actually rang Warmflow and a very nice chap from Northern Ireland rang me back and suggested magnetite in the system said it could be clogged up our plumber has flushed out the system and put cleaner in as it is quite a while since this has had inhibitor in and we have had radiators on and off for decorating ect so Warmflow suggested inhibitor has probably become diluted. He suggested a power flush but seems extremely expensive our plumber is trying manual clean first to try and save us some money. As it is only a possible solution we are still trying to find other possible causes.

 

[WHPES]

Wouldn't pay too much attention to that. Unless there is evidence of heavy soiling in the system you don't need a powerflush - sounds like they have run out of ideas. I would bet money that magnetite wouldn't have anything to do with a high limit stat tripping out.

 

[Rozie]

Mmmmm thanks Wipes pretty much what our plumber said that's why I think he went the cheapest route, I think we will go with process of elimination and go for cheapest part first so HL thermostat it will probably be. The HL reset button has been pressed numerous times and in my research it does say repeated resetting renders the HL thermostat useless anyway.

Cheers

 

[kimbo]

First of all I think you will need a proper engineer,There is a hot water tank stat on this one which would probably be the one that is a t fault because if it was a faulty hl stat it would trip on ch as well, the hot water store does not get as hot as the central heating water. Next warmflow use a two pump system, if you are getting hot water when the heating only is on it would probably be one of the check valves in the pump port that has gone, they are only plastic.I suspect your engineer may be lost on this one, I would advise getting warmflow to give you a name of a local guy who knows their boilers and is trained up on them, a really good engineer should be able to sort it out.