My central heating is working okay but the water isn't heating up. The only way I can get it warm is to reduce the flow to a trickle. Any suggestions as to what the problem may be?
I've had someone out, he's said it MAY be the diverter valve (£160 to fit a new one) but there may be other problems. Does this seem reasonable? The boiler is 14 years old, we've had very little issue with it and I don't really want to have to buy a new new one.
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