E10 on a Baxi is an external probe fault. The outdoor sensor used for weather compensation is not giving a usable reading.

One of the least disruptive faults on the list. In most cases the boiler carries on heating, just less efficiently.

What E10 actually means

Weather compensation uses an outdoor probe to match the flow temperature to the outside conditions, which saves gas and makes the house more comfortable.

If the probe fails, the boiler loses that function and flags it so you know.

What you can safely check yourself

If you know where the outdoor probe is, usually on a north facing wall, look at it. Damage, water ingress or a knock from a ladder are all common.

The wiring and probe need testing beyond a visual check.

When to stop, and why

What causes it beyond the simple checks

A failed probe, water ingress into the probe or its connections, damaged cable, a poor terminal connection at the boiler, or a board input fault. Outdoor sensors live outdoors, so weather related failure is the norm.

How Vantage can help

We are Gas Safe registered under 956889 and cover Hertfordshire, Bedfordshire and Cambridgeshire, with an emergency line answered 24 hours a day. Call us on 01462 506374. See also boiler repair and boiler servicing.

Frequently asked questions

Will my heating still work with E10?

Usually yes. You lose weather compensation, which costs you a little in efficiency.

Is it worth fixing?

If you paid for weather compensation, yes. It is a genuine efficiency feature.

Could it be the cable rather than the probe?

Frequently. It gets tested rather than assumed.

Related fault codes

Other Baxi codes: E09 · E20 · E28 · E110 · E119 · E125 · E128 · E133 · E160 · all boiler advice. See also boiler repair. The same fault on other makes: Ideal F6.

In Baxi’s own words

Baxi use different code sets across their ranges and generations. The definition above comes from The Baxi error code table. If your boiler is a different model and the code behaves differently, check the manual for your appliance or ring us and we will tell you what it means on your unit.

When to call an engineer

If the checks above have not cleared it, the next steps are engineer work and the boiler should not be reset repeatedly in the meantime. Call Vantage Plumbing and Heating on 01462 506374. We are Gas Safe registered under 956889, the line is answered by a person at any hour of any day, and you get a price before anyone starts.

Need help today?

Call and speak to a person, any hour, any day of the year. Get a fixed price quote or call 01462 506374.