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We have 201 questions about mending 'boiler demand hot'

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Mend Heating, Home Heating Systems

low water pressure F28 lockout, Vaillant Turbomax plus 828E ?

Hi guys, Hope you can help. I've viewed all the relevant and some of the irrelevant posts on similar subjects ... [Read more]
Mend Heating, Home Heating Systems

Bosch Worcester 25si boiler pre 2003 model?

My system seems to have developed a fault in that despite all hot water taps being off the hot water demand li... [Read more]
Mend Heating, Home Heating Systems

i have no hot water. ?

I have an old worcester 350 boiler. my heating works fine but i cant get hot water on. The green light demand... [Read more]
Mend Heating, Home Heating Systems

halstead ace high boiler not firing up?

Halstead ace high boiler wsnt firing up on demand for hot water, had split diaprham changed and pin is contact... [Read more]
Mend Heating, Home Heating Systems

Alpha 240x shuts down,restarts, shuts down etc etc?

My Alpha 240x combi boiler wont stay lit for more then 20 secs then shuts down, it then relights some 15 - 20 ... [Read more]
Mend Heating, Home Heating Systems

Hot Water Problem with Ideal Isar He24 Combi?

Hi, Can anyone help? A friend of mine is having problems with her hot water supply from her Ideal Isar He2... [Read more]
Mend Heating, Home Heating Systems

Central Heating problem with Worcester Bosch RSF 240?

I have recently changed my leaking diverter valve on my Worcester Bosch RSF240 combi boiler. The hot water op... [Read more]
Mend Heating, Home Heating Systems

Vaillant Turbomax 828 problem?

This is a strage one! I am not sure whether my diverter valve is on the way out or whether something else is c... [Read more]
Mend Heating, Home Heating Systems

Ravenheat CSI 85AT fires up and goes of every 20 seconds?

I have a Ravenheat CSI 85at that is just over 3 years old. This is the one that does NOT have the honeywell ga... [Read more]
Mend Heating, Home Heating Systems

sime boiler 80 E?

I have a sime boiler friendly format 80 E. The flame will not ignite when placed under demand either by hot wa... [Read more]
Mend Heating, Home Heating Systems

How Can I Fix A Potterton EP2002 Heating System?

My daughter has a Potterton EP2002 system with a Potterton Suprima 40L boiler and a MPE322 diverter valve. Th... [Read more]
Mend D.I.Y, Plumbing

no central heating on demand?

when i select CH boiler fails to ignite but when i select just HW i get hot water and central heating is th... [Read more]
Mend Heating, Home Heating Systems

24i/28i Junior Problem?

Father christmas has brought me an early present! Please help if you can! My boiler knocked off while in use a... [Read more]
Mend D.I.Y, Plumbing

Would router interfere with wireless room thermostat?

Our room thermostat ( Honeywell) has ceased to communicate with our boiler.This coincides with having a router... [Read more]
Mend Heating, Home Heating Systems

No heating, but hot water. Boiler tells me there is ' NO demand for heat'?

I have a Vaillant ECOtec plus combination boiler. I rang Vaillant and they asked me to make various checks. T... [Read more]
Mend Heating, Home Heating Systems

potterton performer 24kw HEcombi?

Hello ,is there any quallified heating engineers out there who may know wat this fault is. no hot water,the p... [Read more]
Mend Heating, Home Heating Systems

Worcester 24i RSF Junior - Water Flow Switch Melted!!?

Hi, had a few probs recently wi boiler, new Gas Valve & new PCB within last 2 months seemed to have sorted it.... [Read more]
Mend Heating, Home Heating Systems

Worcester boiler 28 cdi - Re igniting when lit?

I have had a number of problems with a Worcester 28 CDI recently. The board had to be replaced as a circuit h... [Read more]
Mend Heating, Home Heating Systems

Worcester Bosch 240 RSF not firing?

Worcester Bosch 240RSF combi boiler. Soft water, high mains pressure. Here's the problem: I had replaced th... [Read more]
Mend Heating, Home Heating Systems

worcester 350 combi boiler keeps tripping RCCB?

As soon as demand for either hot water or central heating is called for the RCCB in my consumer unit trips.Any... [Read more]
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