Boiler clicking and showing fault

[Joyrider1]

Woke up this morning to our Ideal Icos boiler constantly clicking and showing a fault code of H1.

Anyone in the trade on here that might know what this fault code means? The manual doesn't seem to say. Have booked an engineer coming out this afternoon to look at it, but would like to understand what the fault code means before he turns up.

Cheers!

[Road2Ruin]

Haven't got a clue on the fault code but if it is a combi check the pressure is correct, if not top up. That would be a simple fix. It has happened to me before in the morning.

[anonymous-user]

H1 (Flow thermister error)

From Google.

[Joyrider1]

Dave_ST220 said:

H1 (Flow thermister error)

From Google.

Damn, was googling it myself but never found it (must be the hangover)- cheers!

Although having said that, don't really know what it means but no doubt it will be expensive :-(

[Arthur Jackson]

Joyrider1 said:

Although having said that, don't really know what it means but no doubt it will be expensive :-(

If it is the thermistor it's fairly cheap, but it could well be the Primary Controls Board. They are hideously unreliable. And about £140.
You need to check resistances at given temperatures on the thermistor OR just buy one and hope it's that.

[Ricky_M]

Had one of these a while back with the same fault code.

Turned out that the top of the heat exchanger had melted and burnt through the wiring loom.

Hope for your sake that its not the case as a new heat exchanger was upwards of £500. Make sure they check this as it wasn't noticeable until the boiler eventually fired (with a twiddle of the loom) and an orange glow could be seen.

As Mr Jackson said, the PCBs are also troublesome. You either lose all power or it throws up incorrect fault codes.

The thermistor that the code relates too is cheap and a dry fitting so will take minutes to change over.

[Joyrider1]

Thanks for the replies all, well the engineer came and to start with it looked like dry thermistor connection as it all kicked back into life once that was sorted. However the fault soon came back, and it turned out to be a dodgy PCB

So the new PCB was £217 +VAT, then after the labour charges etc, got stung for £417

So I am not a happy chappy, and for the icing on the cake, the wife went next door this evening and it turns out that the bloke is a director for a company that supplies and fits these things and he could've done it for me much cheaper. For fks sake.

[Ricky_M]

Nearly £200 labour??

Those PCBs are the easiest I've ever fitted. You remove the front and lower casing, remove the display board, unplug connectors, prize board from cradle and reverse for fitting!

The PCB and Thermistor could have been fitted in less than an hour with ease! Its not your fault he didn't diagnose it properly!

[Joyrider1]

Ricky_M said:

Nearly £200 labour??

Those PCBs are the easiest I've ever fitted. You remove the front and lower casing, remove the display board, unplug connectors, prize board from cradle and reverse for fitting!

The PCB and Thermistor could have been fitted in less than an hour with ease! Its not your fault he didn't diagnose it properly!

Nah, it was about £130 +vat for the labour - they didn't have the PCB so had to go get one. I'm sure it would be an easy job if you know what you are looking at, but I needed it sorting out quickly. And you know what it's like when you call tradesmen, standard hourly rates / call out charges etc. Can't be arsed with all the ringing around, so used someone on a recommendation.