What does the Ideal 25 fault code mean?

Your boiler is unable to create a spark to light the gas, meaning your heating and hot water will not work.

How much does it cost to fix Ideal error code 25?

Typical repair cost for the Ideal 25 fault is £120-280 including labour.

Ideal 25 Fault Code: What It Means & How to Fix It

What the manual says

Manufacturer manual

The connecting wires of the igniter do not make contact or the igniter is defective or the fuse F1 is defective. Control panel should supply 120 V to connector.

Shared across the Maximiser SE range

This code is shared by the boilers in this range, which use the same control board. It may not be printed in this exact variant’s manual.

What causes this fault?

This fault occurs when the boiler's control system attempts to start the heating process but cannot generate the electrical spark needed to ignite the gas. The most common reason is that the ignition components have worn out over time or a small internal fuse has blown, preventing power from reaching the burner. This results in a safety shutdown because the boiler cannot detect a flame.

Engineer required

This is a high severity fault. Stop using the boiler and call a Gas Safe registered engineer. Do not attempt gas-related repairs yourself.

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All 118 fault codes on the Maximiser SE

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

-. / A -. / H -. / Y -. H =. / H =. H 0 / A 0 / H 0 / Y 0 or -. / H 0A 0H 0L 0U 0Y 001 01 1 / C 1C 2 / C 2 / F 2 / P 2 / U 2C 2F 2P 2U 03 004 4 / A 4 / C 4 / F 4 / L 4 / P 4 / U 4 / Y 4A 4C 4F 4L 4P 4U 4Y 005 05 5 / A 5 / Y 5A 5Y 6 / A 6 / C 6 / H 6 / L 6A 6C 6H 6L 7 / A 7A 7C 7F 7H 7L 008 8L 9A 9C 9F 9H 9L 9P 9U 010 10 011 12 13 14 15 016 16 017 17 18 018 19 20 21 23 24 26 27 28 29 029 30 31 32 34 35 36 37 38 39 40 41 041 42 43 60 EA EC EF EH EL EP No display

Your boiler is unable to create a spark to light the gas, meaning your heating and hot water will not work.

What the manual says

What causes this fault?

Engineer required

Avoid the next call-out bill

All 118 fault codes on the Maximiser SE

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