IDEAL HE24 ISAR Problem?

smagni · 18 Apr 2009

We have had this boiler fitted for about 18 months now and (touch wood) it seems to be running well. Except for the fact that when the boiler is on but no domestic hot water or central heating required, in other words when "0" is in the display, it will suddenly kick into life and the letter "t" will be displayed, the burner will light for 20 seconds then go back to "0". It does this several times during the day and also through the night, which is quite annoying.

My question is...

Is this normal for this boiler or is there an explanation and should I get the engineers back?

Thanks in advance for any advice you can give!

twgas · 18 Apr 2009

probably the preheat

corgiman · 18 Apr 2009

Have got a dripping hot tap??

scatmanjohn · 18 Apr 2009

Its meant to do it. However if it really is too much to bare then a kit is available to disable it.

smagni · 18 Apr 2009

twgas said:
probably the preheat

...Perhaps you could elaborate?

corgiman said:
Have got a dripping hot tap??

...Not got a dripping tap Hot or Cold. The display shows "t" though, not "d"!

scatmanjohn said:
Its meant to do it. However if it really is too much to bare then a kit is available to disable it.

I would really like to disable or at least make it less regular, could you point me in the right direction?

scatmanjohn · 18 Apr 2009

Not sure of the part No for the kit, or what it consists of.

Ring Ideal, they will tell you.

http://www.idealboilers.com/fault_assistant/isar_other_display.html

swbjackson · 18 Apr 2009

I've got one in the van. I'll check the part number later.

gas4you · 18 Apr 2009

The Ideal part number is 202310.

The parts/plumb center no is 123948.

Retail £139 + VAT

swbjackson · 18 Apr 2009

That's saved me a trip to the van.

davebgas · 19 Apr 2009

Diverter could be passing as well allowing the preheated DHW to seep down the the CH causing preheat activation to frequently - the preheat will kick in when the thermistor sees less than 30degrees in the plate and preheat to 65degrees.

Doesnt need to be a dripping tap tho.... could be a leak on the hot supply....

Kristoflampie · 19 Apr 2009

Check for plate heat exchanger O ring leaks which is yet another old fave fault, the amount of built in Isars in nearly new houses we go to where the leak goes down the back of units or behind trim out of sight after falling off the bottom cover plate is unbelievable. It simulates the dripping tap thing and up pops the 't' every few minutes to preheat . No pressure loss from heating side usually.

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IDEAL HE24 ISAR Problem?

davebgas

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