Ariston Combi boiler issues (no hot water) A03 error code.

[Matt Cup]

Does anyone know how to reset this code?

Edited by Matt Cup on Thursday 27th May 08:30

Edited by Matt Cup on Thursday 27th May 08:31

[silversurfer1]

Sounds like you have a blockage or partial blockage in the plate heat exchanger or possibly a sensor issue.

try just pressing and holding the reset button

SS

[PositronicRay]

When you say powering on and off do mean the mains switch?

Not the same model as yours but an ariston combi, would only take so many goes at resetting. Turning off leaving for 5mins would clear the code.

[Matt Cup]

Tried doing that mate in several different ways. For example powering down, holding the button and Turing on or leaving it on and holding down the button. Just can’t for the life of me remember what the engineer did last time

I’ve also tried bumping up the water pressures bit to see if that was the cause.

[Jediworrier]

https://www.aristonboilersguide.co.uk/troubleshoot...

[Matt Cup]

Thanks, looking at the troubleshooting guide my combi doesn’t seem to want to play ball. Unless I am misreading it I just cannot seem to get it to re-light.

[Jediworrier]

Does it try to do anything at all before teh code pops up? Fan kicking in/ gurgling/ ignition sound?

[Matt Cup]

When I completely power it off from the mains and turn it back on a pump of some sort runs for a brief moment whilst displaying d 65 code. This then goes blank and I then proceed to turn the on/off switch on the unit to the on position where the a03 error code displays straight away.

[Jediworrier]

Check the condense syphon hasn't silted up.

[miroku1]

Is the circulating pump operating correctly?

[Matt Cup]

Jediworrier said:

Check the condense syphon hasn't silted up.

Can’t see one of those underneath it I don’t fancy opening the boiler up, no doubt I’ll end up breaking something

Got someone coming out in the morning, hopefully he’ll be able to sort it and I’ll update this with the resolution.

miroku1 said:

Is the circulating pump operating correctly?

Not sure to be honest as nothing appears to be working at the minute due to not being able to clear this code.

[Matt Cup]

Boiler fixed (temporarily), engineer said that the gas valve is sticking which is preventing the reset to occur.

All he appeared to do is take the front off, disconnect some spade connectors off the igniter and then reset the unit.

Now just hoping it holds out for a while until we get the house remodelled and a new boiler is purchased.

[sherman]

Matt Cup said:

Boiler fixed (temporarily), engineer said that the gas valve is sticking which is preventing the reset to occur.

All he appeared to do is take the front off, disconnect some spade connectors off the igniter and then reset the unit.

Now just hoping it holds out for a while until we get the house remodelled and a new boiler is purchased.

I have a newer ariston boiler. So far it works faultlessly. It was installed 3 years ago. The wifi thermostat (ariston net) that comes with it is really good.