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Subjects

What is it doing?

Find the line that matches what you can see, hear or smell, and it takes you to the entry. If you can smell gas or a carbon monoxide alarm is sounding, go straight to the gas or carbon monoxide entry.

The display or lights

A code is on the displayFind your maker in the fault code list F.22 or F.28 on a VaillantWhat the Vaillant manuals say F.22, F.28 or F.83 on a Glow-wormWhat the Glow-worm manuals say CL or E3 on a ViessmannWhat the Viessmann manuals say Letters such as EA or LoPr on a WorcesterWhat the Worcester manuals print A number such as E119 or E133 on a BaxiWhat the Baxi group documents print F1, L2 or a text message on an IdealWhat the Ideal guides say It asks for a resetHow makers' reset methods differ

The pressure gauge

The needle is below the green or red lineWhat the gauge should read You need to top it upRepressurising by model family It keeps droppingWhere the water may be going It reads too highWhat high pressure means Water is dripping from a pipe outsideThe pressure relief valve

The radiators

Cold at the top, warm at the bottomTrapped air Cold at the bottom, warm at the topSludge One room hot, another coldBalancing Won't get warm with the valve onThe thermostatic valve Radiators or pipes make noisesAir, flow and kettling

Cold weather

It stopped in a freezeFrozen condensate pipe A white plume outsideFlue and plume It runs on its own on cold nightsFrost protection

Hot water

Hot water is slow or weak at the tapCombi boilers The tank in the cupboard won't heatHot water cylinder Furred kettle, slow hot water, hard-water areaLimescale in a boiler

A smell, or an alarm

You can smell gasWhat to do, and the numbers A carbon monoxide alarm is soundingWhat to do

Paperwork and money

It's old and you've had a quoteWords on a boiler quote You rent a home outLandlord gas safety record You've heard about a grantGrants by country It's time for its yearly checkBoiler service