Grant Vortex 36kw - Needs rebooting daily

ep90

ep90

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21 Apr 2017
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We've got a 10 year old Grant Vortex (outdoor, 36kw oil fired) has developed a odd problem. If you turn it off and on, it works fine (mostly, the hot water temperature is a bit inconsistent) but if you leave it for a long time it stops working. No CH or DHW. There are no warning lights on, it's all fairly cold inside the boiler housing - however, if I turn it off and on again it works fine. Any ideas? Getting fed up of going outside in my PJ's every morning!

Many thanks!
 
It does need topping up from time to time, but the low pressure light isn't on. The programmer seems to be working as I can see the feed from it is live when CH is on. What's odd is once it's fired up again (sometimes takes some coaxing) it works fine. Sometimes if I take the right hand clear relay out, it will fire up fine. I leave it for a bit and put that relay back in and the CH & HW work. It's getting worse as just turning it on and off is not always the cure now. I've ordered a replacement clear relay as I can see some scorch marks but there is a good contact when checked with a DVM. Any ideas? Which PCB gets replaced the most? Bit reluctatant to change it as it's £100+

Also, does anyone have the internal wiring diagram to hand?
 
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