COMBI BOILERS - NO TANKS, MAINS WATER PRESSURE, SEALED SYSTEM
Simply put, a combination boiler provides instantaneous hot water and central heating on demand.
"My hot water gets hot then cold" ~ "My hot water is tepid" ~ "My boiler will not fire up and I have a red light on" ~ "My radiators warm up when I run a tap" ~ "I keep losing pressure and I'm having to re-fill my system every day"
"WARNING! If your boiler is not switching on, YOU have to!"
The causes of your hot water going hot/cold/hot, or that it is tepid are:
1: The water flow rate is too great for your boiler, all boilers have different flow rates that they can cope with. For example, a boiler that is designed to heat up 12 litres per minute, will struggle to heat up 16 litres per minute. You will notice sometime that if you turn your tap down to a lower rate that your water will be hotter.
2: You live in a hard water area and your boiler is not protected by a scale reducer. To check if you live within a hard water area, visit this website: www.scaleguard.co.uk
3: Your boiler has a component called a 'Thermistor', this regulates the temperature of your water coming out of your taps. Essentially this small little component communicates with the 'brains' of your boiler. If your brain is receiving mixed signals it will act accordingly. Thermistors can be affected by scale deposits, their accuracy can diminish with age. Low-cost item!
4: If your radiators warm up when you run a hot tap, then your diverter valve will be passing. These can sometimes be fixed by taking apart and replacing just an 'O-Ring', or by using a diverter repair kit. Depending on your engineer will sometimes determine how much this repair costs you!
5: If your combi is failing to come on, or it comes on and then goes out, you, the consumer, need to switch ON at this point. This type of breakdown is very common and can end up becoming expensive.
The reason for this can be for many reasons such as misdiagnosis by the engineer, the fault appears to be intermittent (there is no such thing as an intermittent fault, there is an underlying issue) you then have multiple call outs and therefore labour fee's, the fault could be with the PCB, which are never cheap.
5 things you MUST be aware of with this type of fault
1: Does the boiler actually light up?
2: Can you hear things running inside the boiler, but nothing is firing up?
3: Does your boiler fire up and then IMMEDIATELY go out?
4: Does your boiler stay on for 0-5 mins, 5-10, or 10-30 before going out?
5: Have you checked the system pressure gauge?
Knowing when a boiler is failing can tell you what must be failing.
If you arm yourself with this knowledge before calling an engineer, then you will immediately take control of the costs when dealing with this type of breakdown.
Want to know why? Then click here.
SO YOU DONT HAVE A COMBI!
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