heatexchanger

Hi, I am dealing with a problem in a 2008 gloworm 18hxi. It works, and the house gets warm. But not as quick as it used to, and it does that on/off/on/off/on thing when the flow in the exchanger is knackered, and it is trying not to overheat. I appreciate it is old and so whole replacement...

I have a problem with my linea 28, the engineer just replaced the Domestic hot water heat exchanger and the Main PCB (old one was fried). The PCB was changed first and then it was intermittent cold and hot water, he suggested the domestic hot water heat exchanger be replaced which he did...