Ultracom₂ 35 Store High

Glow-worm Ultracom₂ 35 Store Fault Code

Also written as ULTRACOM35STORE — same fault.

The Glow-worm Ultracom₂ 35 Store fault code means: your boiler has likely detected a problem with the temperature sensors or its internal memory, preventing it from heating your water correctly.. It appears on 3 Glow-worm models in our database.

Call an engineer soon

Book a Gas Safe engineer within 24 to 48 hours. Your boiler may be unsafe or could break down completely if left.

Technical description: F02 / F12
Typical repair cost £120-£350 (including labour)

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 for a qualified engineer in your area.

Gas Safe Register →

Glow-worm models that show the Ultracom₂ 35 Store fault code

Click a model for the full fault code list and model-specific repair notes.

Source

Glow-worm Ultracom₂ 35 Store fault code information on this page is sourced and cross-checked against the official Glow-worm service / installation manuals for each affected model.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed 27 April 2026