Combi Boiler - Hot Water Running HOT and COLD

Is your hot water cycling hot and cold? Do you want to learn what might be causing it and how to fix it? Learn As I Do will take you through the journey of detecting the issue with your boiler and how to fix the problem.

The problem with this BAXI combi boiler was a clogged heat exchanger which needed replacing.

[phoneblaster]

...nice video thanks . My boiler a valiant is also having the same problem . In addition I have noticed that the pressure drops and every 12 days I need to turn it up again . Does this mean I have another problem like a leak ? I have checked all the radiators and all seem fine . Naturally I cant see under the ground floor floor boards . Any advise welcome . Thank you .

[Athlete-Athlete]

My baxi boiler has hotwater but no heating .

[branislavlancuski]

Central heating or domestic water heat exchanger?

[monicas]

I have a similar problem with my boiler, it's so annoying. My system is insured so I've called someone out to look at it more than once and because the problem is intermittent, guaranteed it doesn't happen when they call. I've had the diverter valve replaced and the sensor. The engineer tells me that it's working fine and as it should be. It hasn't been fine since November 2022 when there was a leak and the diverter valve or something was replaced. I wonder sometimes if they've done something deliberately to make me change my boiler as it's over 15 years old.

[btnled]

Looks to me like u have the hot water control set on the low side. I let mine go momentarily into the 80c range .. Thermostat controlled shower valve can then cope and maintain a constant temp. If I set the dial lower I experience too much of a temperature variation in the shower.

[whoisme]

Many thanks bud. Relatives boiler doing the same and it is a baxi boiler. 👍

[nimikshaa]

i have baxi 105e and none of my lights are on when the heater is on. So I'm not getting at hot water as well as no heating. what might be the issue?

[deanjohnson]

I have a baxi boiler and mine just run luke warm and boiler stays lite I am guessing its the same issue boiler is around 14 years old x

[sukuraii]

Why I couldn't see your videos????

[lazylady]

if i went to the trouble of cleaning a plate HE I'd 100% put a lime scale filter on mains before boiler to help stop it happening again. From the description of your problem id of tested or just swapped out NTC sensors too.

[balbindersingh]

hi when turning hot water tap quarter turn boiler kicking in and out having hot water but when fully open hot water is warm to cold boiler staying on what can the problem be

[richardking]

If there is sludge in the radiators, this would surely cause the heat exchanger to block again - I imagine fitting a brand-new one could also be a temporary fix!

[TheHairyHound]

The issue of hot water running hot cold hot cold can be due to a heavily contaminated impeller. If so, it's a 30 minute £0:00 fix 👍👍

[ArcanePath]

Faulty diagnosis. It could be the thermistor giving a wrong reading and cutting out too soon. You should not be so quick to conclude a problem without full investigation.

[eazyrat]

tip if you haven't already you should get a magnetic filter on your heating circuit (usually under the boiler) as this will collect any crap that's in your system and stop it going in to your boiler and causing damage to other pricey components. these can be cleaned out every year if you have a service or yo can do it yourself.

[rlfdfd]

I have a ideal combi boiler and both taps and shower hot water fluctuated hot and cold.

The British gas engineer found a worn seal in the divertor valve, which was leaking water into the mounted electronic actuator.

He removed the black box, removed the divertor and replaced the internal seal which was the size of a pin head.

He replaced the black box actuator too.

[Zaine]

That's most likely cause you don't have a Magna clean installed on your heating system or your not getting it serviced every year

[brennburroughs]

Obviously you can’t do it yourself… to take the case of you have to be gas safe.