@PigletJohn or any other plumber, we have two boilers, one in the kitchen that provides hot water (combi) and another in the attic for heating (combi also). The pipes are hissing as though there's hot water going through but nothing is coming out of the hot taps. The pilot light's on and the boiler's fired-up.
Heating is on fine, so presumably it's the kitchen boiler gone amiss. Shouldn't be frozen pipes as we're in a much warmer thawing situation today.
Am worried it's all going to blow up. DH has turned the kitchen boiler off, all hot taps are off, but they're still making the 'hot water running sound.
Any advice?