How much does it cost to fix Remeha error code 1 2.?

Typical repair cost for the Remeha 1 2. fault is £90-180 including labour.

1 2. High

Remeha 1 2. Fault Code

Q: What does the Remeha 1 2. fault code mean?

Your boiler's internal electronic protection has triggered and the unit has completely lost power due to a failed internal fuse.

Also written as 12 — same fault.

The Remeha 1 2. fault code means: your boiler's internal electronic protection has triggered and the unit has completely lost power due to a failed internal fuse.. It appears on 5 Remeha models in our database.

Technical description: Control fault: Fuse F1 (3.15 AT) defective.

What causes the Remeha 1 2. fault?

This fault occurs when the boiler's internal safety fuse blows to protect the sensitive electronics from an electrical surge or component failure. The most common reason is an internal leak or a failing water pump that has short-circuited and drawn too much power. Because the fuse has blown, the boiler acts as if it has no power at all and will stay completely dark until the fuse and the faulty part are replaced.

This fault is more common at the start of winter when the heating is first turned on, as pumps that have been sitting idle over summer are more likely to seize and cause an electrical short.

Typical repair cost £90-180 (including labour)

Engineer required

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

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Remeha models that show the 1 2. fault code

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

Source

Remeha 1 2. fault code information on this page is sourced and cross-checked against the official Remeha service / installation manuals for each affected model.

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