Low
S.34 on Glow-worm Energy7 Regular

Your boiler is temporarily running its pump to prevent the internal pipes from freezing, which is a normal protective feature during very cold weather.

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

Frost protection active

From this model's manual
Verified against the Glow Worm Energy7 Regular installation & service manual, page 40.
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

Ensure your heating is set to a schedule that prevents the house from becoming extremely coldCheck that your boiler is not located in a draughty or uninsulated areaMonitor the display to see if the code clears once the ambient temperature rises

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

Avoid the next call-out bill

Monthly cover means no unexpected bills when your boiler breaks down.

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 fault codes

S.30View →S.31View →

Related guides you might find useful

Banging / kettling / whistling noise

Each noise points to a different fault.

Read →

Yellow or orange flame — CO safety

Safety-critical — turn off, read this.

Read →

Frozen condensate pipe

Winter cause of ignition lockouts.

Read →