Heating on but no hot water in your Coventry home? What is usually behind it on combi and system boilers, the safe checks to try first, and when to call an engineer.
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When the radiators heat up but the hot taps stay cold, the problem is usually in the part of the system that sends heat to your water. On a combi, it is very often the diverter valve, which switches between heating and hot water and can stick in one position. Scale in the plate heat exchanger is the other big cause, and Coventry has fairly hard water, so older combis across the city get it a lot.
If you have a hot water cylinder, start with the controls: is the hot water switched on at the programmer, did a power cut reset the clock, and is the cylinder thermostat set high enough? A failed motorised valve is the other common reason.
Student lets around Earlsdon and Canley, and the many converted houses across the city, often have combis that work hard all year, and those are the ones we see this on most. It is usually one part, tested and replaced.
A hot water tank in a cupboard means a system or regular boiler. No tank usually means a combi.
On tank systems, make sure hot water is on and the timer is correct.
Open a hot tap fully. Combis need enough flow to fire for hot water.
Around 1 to 1.5 bar when cold is normal. Very low pressure can stop it firing.
Tenants should let the landlord know. Landlords, ring us and we will arrange access.
On combis, usually the diverter valve or scale. On cylinder systems, often the timer, thermostat or motorised valve.
It contributes. Scale builds up in combi boilers over time and restricts hot water.
Generally yes. Smell gas, or think something is not right? Get everyone outside, leave the switches alone and ring the National Gas Emergency line on 0800 111 999.
Message or ring with the boiler make and what it is doing, and we will tell you when we can get to you.
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