High
Spare PCB Not Set on Ideal Logic+ HEAT2 H12

Your boiler's computer module has been replaced but has not been programmed to match your specific heating system, preventing the boiler from functioning.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

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.

What the manual says

Manufacturer manual

Spare PCB Not Set

From this model's manual
Verified against the Ideal/Ideal Orig Ideal Logicplus Heat2 Installation Servicing 09 2024 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 is a high severity fault. Stop using the boiler and call 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 Spare PCB Not Set: 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.

Related fault codes

L1View →L2View →

All 17 fault codes on the Logic+ HEAT2 H12

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

Blocked Flue/CondensateFan FaultFlame LossFlame On Before Gas OnFlow Thermistor FaultFlow/Return ReversedGas Valve FaultIgnition LockoutLow Mains VoltageNo Water FlowOutside Sensor FaultOverheat LockoutPCB FaultReturn Thermistor FaultRoom Thermostat FaultToo Many Restarts

Related guides you might find useful

When to replace your boiler

7 signs repair isn't worth it anymore.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →

Boiler service cost

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

Read →