Low
d.94 on Glow-worm Ultracom 35 Store

This is simply an administrative setting on your boiler used by engineers to clear out past error messages, rather than a sign of a real fault.

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

Erase the fault code history from the appliance

From this model's manual
Verified against the Glow Worm/Glow Worm Ultracom 35 Store 4701915 installation & service manual.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

Engineer required

This fault requires a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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 d.94: 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.

All 70 fault codes on the Ultracom 35 Store

Seeing a different code? Every code this model can display, in one place.

ErrF00F01F1F02F03F3F10F11F12F13F20F22F23F24F26F27F28F29F32F49F61F62F63F64F65F67F68F70F71F72F73F74F76F77F79F81F83F84F85F86P.05P.06P.07S.00S.01S.02S.03S.04S.05S.06S.07S.08S.20S.21S.23S.24S.25S.26S.27S.28S.30S.31S.32S.34S.53S.54S.96S.98

Related guides you might find useful

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 →

Boiler service cost

What a UK service costs and what a proper one includes.

Read →