ideal isar he35 d.h.w. probs

neilll · 10 Feb 2009

hi all,
can anyone help with my problem!when turning hot water tap on,d is displayed and boiler fires up (light on ),water starts to come out hot then boiler shuts down (water cools down) d still displayed 10/20 secs later boiler fires up e.t.c. can fill a bowl for washing up but bath ends up luke warm. i have changed d.h.w. thermistor but it has made no difference. bolier is 4 years old and i have not had any problems untill now.any advice will be much appreciated, thanks

Dan Robinson · 10 Feb 2009

Scaled/clogged plate heat exchanger or possibly a duff diverter valve.

neilll · 11 Feb 2009

thanks for the prompt reply dan,
i am assuming the diverter valve is working as i am getting some hot water and i can see the valve moving.is there a refurb kit available for these heat exchangers as i don't want to remove and clean only to find that i can no longer get the unit to seal again,or should i bite the bullet and buy a new heat exchanger (any one know of any going cheap?)
regards neilll

weareleeds · 12 Feb 2009

When system is cold turn on hot tap & feel 22mm pipes on lhs of boiler if they get hot your diverter valve is passing. Make sure you get the correct cartridge ie honeywell (which fits a lot of boilers) if it is a red actuator you will need the unique ideal cartridge (VF)

idealnumber1 · 12 Feb 2009

check 22mm flow pipe when running tap,if's getting warm,remove diverter head push pin in a few times,put diverter head back on head try hot water again,if not hot water replace diverter manifold,if still not hot unblock the PLATE HEAT EX,don't confuse this with the heat ex.

neilll · 24 Feb 2009

thanks for your reply guys, yes it looks like the diverter valve. i will replace tomorrow and let you know the outcome. i managed to get a complete unit (diverter valve,plate heat exchanger and pump ) brand new off e-bay for the grand sum of £73 + p&p so i should have some spares for the future whatever the outcome.

shambolic · 24 Feb 2009

divertor won't cause it to go on and off as that is the state overheating as heat transfer in plate nottaking place. The divertor valve prob will allow the heat out into rads so boiler should stay on longer. Take flow and return temps on hw to test this. Also make sure you have right hydroblock as thereafe several types that are not interchangeable

snb · 24 Feb 2009

there is also a problem with the fans on these boilers. when it is required to spin faster to produce hot water it slips or moves closer to the fan casing. This then causes it to cut out and then restart again.

shambolic · 24 Feb 2009

snb said:
there is also a problem with the fans on these boilers. when it is required to spin faster to produce hot water it slips or moves closer to the fan casing. This then causes it to cut out and then restart again.

Never ever ever heard of this. And it would give an LF.( not LF) Error Fault code if flame goes out due to fan stoppage.

snb · 24 Feb 2009

it only goes to LF if the fan speed is reduced enough or stopped.

The fault with the fans seems to only affect boilers from oct 06 onwards. Been told their were a batch of poor fans fitted only affects 35kw models. about 5000 fans. I have had 7 changed since beginning of dec08. luckily all boilers were still in warranty.

shambolic · 25 Feb 2009

snb said:
it only goes to LF if the fan speed is reduced enough or stopped.

The fault with the fans seems to only affect boilers from oct 06 onwards. Been told their were a batch of poor fans fitted only affects 35kw models. about 5000 fans. I have had 7 changed since beginning of dec08. luckily all boilers were still in warranty.

Again sorry that is complete mince we have had no tech bulletins for this ( I work as senior engineer for Scotland for ideal). You can get an of if gas valve out of cal when the boiler goes to low fire. Nothing to do with fan. In fact I've only changed about 7 fans in last 4 years in total!!!!

gigz · 25 Feb 2009

neilll said:
thanks for your reply guys, yes it looks like the diverter valve. i will replace tomorrow and let you know the outcome. i managed to get a complete unit (diverter valve,plate heat exchanger and pump ) brand new off e-bay for the grand sum of £73 + p&p so i should have some spares for the future whatever the outcome.

You will need them.

shambolic · 25 Feb 2009

gigz said:
neilll said:

thanks for your reply guys, yes it looks like the diverter valve. i will replace tomorrow and let you know the outcome. i managed to get a complete unit (diverter valve,plate heat exchanger and pump ) brand new off e-bay for the grand sum of £73 + p&p so i should have some spares for the future whatever the outcome.

Click to expand...

You will need them.

FFS gies peace

gigz · 25 Feb 2009

shambolic said:
gigz said:

neilll said:

thanks for your reply guys, yes it looks like the diverter valve. i will replace tomorrow and let you know the outcome. i managed to get a complete unit (diverter valve,plate heat exchanger and pump ) brand new off e-bay for the grand sum of £73 + p&p so i should have some spares for the future whatever the outcome.

Click to expand...

You will need them.

Click to expand...

FFS gies peace

You wont get any working for ideal

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ideal isar he35 d.h.w. probs

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