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https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl DIY Forum >> Plumbing Questions >> Ideal Isar HE30 Combi Boiler Break down https://www.askthetrades.co.uk/cgi-bin/yabb/YaBB.pl?num=1299850012 Message started by LewisTodd on Mar 11^th, 2011, 1:26pm

Title: Ideal Isar HE30 Combi Boiler Break down
Post by LewisTodd on Mar 11^th, 2011, 1:26pm

Hi, ive recently had error codes displaying on my Isar HE30 Boiler H9/L9 which is blockage in the unit or Replacement of thermistor but the strange thing is that the boiler will work for a short amount of time after it has displayed its error message which is displayed as 3 lines you can get hot water and central heating but after maybe 10-20 minutes it will shut down and flash L/9 what im guessing is the PCB Need's replacing? Before i spend nearly £200 on a new one id like to know if it could be something else thats causing this, if anyone has any idea's they will all be greatly appreciated. :)

Title: Re: Ideal Isar HE30 Combi Boiler Break down
Post by thescruff on Mar 11^th, 2011, 2:39pm

I would guess the PCB is about the last thing you would change 8-)

The boiler is overheating.

Poor circulation, check the pump, and HX.

Title: Re: Ideal Isar HE30 Combi Boiler Break down
Post by LewisTodd on Mar 11^th, 2011, 3:07pm

Thank You for replying.

Thing is when its first turned on after its cooled down for hours it still shows the flashing 3 lines so its not over heating could it be thermistor problem or a sensor? Just before christmas the temperature here dropped below -16 and all our pipes froze and burst 11 pipes in total including radiator pipes im guessing the extreme low temperature might have damages the sensors possibly. Its not the pump its working correctly. Thnx

Title: Re: Ideal Isar HE30 Combi Boiler Break down
Post by thescruff on Mar 11^th, 2011, 4:29pm

What happens if you power the boiler down electrically and turn it back on after a few minutes.

Title: Re: Ideal Isar HE30 Combi Boiler Break down
Post by LewisTodd on Mar 11^th, 2011, 4:40pm

Just tried it and it came up with d for Hot water demand when no taps were on, working now till it warms up a little give it 20 mins will display L...9... or the 3 lines.

Title: Re: Ideal Isar HE30 Combi Boiler Break down
Post by Wayne B on Mar 11^th, 2011, 4:51pm

If the pump is running O.K not speeding up and slowing down or sticking afer a few mins, and the thermistor/flow sensor fine then it sounds like the board but check the others first bud.

Title: Re: Ideal Isar HE30 Combi Boiler Break down
Post by Wayne B on Mar 11^th, 2011, 4:59pm

I skipped round checking for blockages as I assume when it does work it circulates O.K ?

Title: Re: Ideal Isar HE30 Combi Boiler Break down
Post by LewisTodd on Mar 11^th, 2011, 5:20pm

Ill Ohm check the Thermistors/sensors when i get the chance, last thing i want to do is buy a new PCB for it, and yes when it does work the CH Works fine so ive ruled out the pump. But when it does display L...9.. or 3 lines it fires up can feel it getting hot.

Cheers!

Title: Re: Ideal Isar HE30 Combi Boiler Break down
Post by Wayne B on Mar 11^th, 2011, 5:39pm

The older boilers with the black plastic pcb cover were common fault the later orange ones slightly less so.

Title: Re: Ideal Isar HE30 Combi Boiler Break down
Post by LewisTodd on Mar 11^th, 2011, 9:39pm

Yea this one isn't that old system was put in, in 2008 so old 3 years old got a Orange PCB But im sure thats not the problem, it seems to stop and start working its working now so i dont know, wont be working tomorrow has a mind of its own lol ::)

Title: Re: Ideal Isar HE30 Combi Boiler Break down
Post by Wayne B on Mar 11^th, 2011, 10:42pm

That sounds like it is sensing the flow but dropping out check the sensor bud and just watch that pump as well if it is speeding up and slowing down or shows any sighns of being poorly at all get it swapped.

Title: Re: Ideal Isar HE30 Combi Boiler Break down
Post by LewisTodd on Mar 11^th, 2011, 11:38pm

Checked it, pumps working fine, problem is when you first turn it on, like now the Fan speeds up and the display flashed 0 and 3 vertical lines, after say 30 mins it switches to ''d'' for hot water demand even tho no taps are on if i turn a hot water tap on it will work if its left it will switch to L/9 status. Also displays L/9 if you run the hot water for a few seconds then shut the tap off. :-/

Title: Re: Ideal Isar HE30 Combi Boiler Break down
Post by Wayne B on Mar 12^th, 2011, 8:39am

Replace thermistor and try again bud.

Title: Re: Ideal Isar HE30 Combi Boiler Break down
Post by LewisTodd on Mar 12^th, 2011, 3:42pm

Yea i think thats it, ill order some later this week, ill update as it happens. Cheers ;)