High
WATER TEMPERATURE LOW on Chaffoteaux Corvec 28 OF BF

Your boiler is struggling to heat the water to the right temperature because the water is flowing through the system too quickly or the gas supply isn't strong enough.

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

i) Water rate too high ii) Insufficient gas flow iii) Water governor sticking

From this model's manual
Verified against the Chaffoteaux/Chaffoteaux Corvec 28 Of Bf 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 WATER TEMPERATURE LOW: 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 9 fault codes on the Corvec 28 OF BF

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

BURNER STAYS ONEXPLOSIVE IGNITIONGAS TAP STIFFHEATING BODY NOISEHIGH WATER FLOWINSUFFICIENT WATER FLOWPOOR PILOT FLAMEUNSTABLE FLAMES

Related guides you might find useful

Pilot light keeps going out

Older boilers: thermocouple, draught or gas supply.

Read →

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 →