Low
70 on Baxi Solo 3

The number 70 on your boiler is not a fault code, but a label indicating that your boiler is a 70,000 Btu/h model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

What the manual says

Manufacturer manual

20.5kW (70,000 Btu/h)

From this model's manual
Verified against the Baxi Solo 3 installation & service manual, page 4.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Check your boiler's manual or data plate to confirm that 70 refers to the unit's heating capacity rather than a flashing error light.If the boiler is actually showing other flashing lights, consult your user manual for the specific fault sequence.If the boiler is working normally, no action is required.

Find a Gas Safe engineer
Search the official register →
Boiler cover options

Avoid the next call-out bill

A cover plan would handle faults like 70: no call-out fees, no surprise bills.

Approved partner
Domestic Appliance Guard
Unlimited call-outs, 24/7 helpline, no price-hike promise
Get a quote →

Affiliate links. We may earn a commission at no extra cost to you.

Related guides you might find useful

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →