Unknown
Very fast pulses (4 per second) on Ideal Mini

Ideal Mini fault code Very fast pulses (4 per second)

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

What the manual says

Manufacturer manual

Faulty boiler or irregular operation as: Empty primary circuit, No primary circuit flow, Lack of burner ignition, Excessive temperature in the primary circuit, Dip-switch 3 left in the OFF position, Faulty temperature probe

From this model's manual
Verified against the Ideal/Ideal Mini He 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 Very fast pulses (4 per second): 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 11 fault codes on the Mini

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

1 second ON 1 second OFFA short pulse every 4 secondsExcessive temperature on primary circuitFaulty CH temperature probe NTCFaulty DHW temperature probe NTCFaulty primary circuitIgnition gas pressure adjustmentLack of burner ignitionMinimum gas pressure adjustmentN/A

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 →

New boiler cost 2026

Realistic UK prices for a swap.

Read →