Low
hp on Biasi Inovia 2020

Your boiler is currently running a maintenance test mode used by engineers to check emission levels at low power.

Reviewed by the BoilerFaultCodes Editorial Team · Last reviewed

Monitor it

This is a minor fault. Keep an eye on it and mention it at your next annual boiler service. Reset the boiler and see if it clears.

What the manual says

Manufacturer manual

chimney sweep function at minimum power during heating

Shared across the Inovia 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.
Plain-English guidance below. Severity, DIY steps, costs and parts are our interpretation to help you act, not text from the manual.

DIY fix possible

Locate the selector switch or 'Reset' button on the control panel.Press and hold the Reset button for 2 to 5 seconds to exit the service mode.If the code persists, turn the boiler off at the main power switch for 30 seconds and then back on.

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 hp: 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

HpView →

All 47 fault codes on the Inovia 2020

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

AnAn 11cPdPE01E02E03E04E04 +E05E05 +E06E06 +E07E07 +E08E08 +E09E09 +E10E12E12 +E13E13 +E14E14 +E19E19 +E20E21E22E23E24E25E44E50E69E69 +E98E99E99 +Er 99L 01LPMaintenance requiredWrench symbol flashing

Related guides you might find useful

Boiler service cost

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

Read →

Boiler won't turn on: 9-step checklist

Work through these before the call-out.

Read →

Is boiler cover worth it?

Break-even maths on monthly cover.

Read →