Ideal Logic 30 Combi boiler - leaks water when central heating is turned on, what's wrong with it?

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I have a Ideal Logic 30 Combi boiler. I noticed that every time when I have the central heating turned on, the boiler leaks out water from underneath the boiler. It doesn't leak out a lot of water and it's not like a constant leak, but it leaks at least once every time I have the central heating turned on. What's strange is that the boiler appears fine and doesn't leak when I am just using hot water. What could be wrong with it?
 
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Probably a cracked sump - a common problem on these boilers. It needs sorting ASAP before damage occurs
 
what does the system pressure go up to when the heating is on ?
 
what does the system pressure go up to when the heating is on ?
When the heating isn't on, the system pressure is at around 1. When the heating is turned on, it goes to around 1.5 to 2
 
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When the heating isn't on, the system pressure is at around 1. When the heating is turned on, it goes to around 1.5 to 2
That is normal , have a look at Ideal fixed price repair, probably your best bet
 
What is a sump?
It's a big plastic bit at the bottom of the heat exchanger which collects the condensate (and any leakage from the slightly dodgy heat exchangers) and directs it out via the condensate trap to waste.
 

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