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On the front of the Sunvic programmer there are 2 led's that indicate when the hot water and central heating are on. The Central heating led comes on to order, the Hot water seems to come on when it feels like it. I don't have a multi meter but might be able to borrow one. How would I test...

The system is pumped, I have a Honeywell 3 way port valve. Cylinder stat (no room stat) and the boiler is a potterton neataheat 60E

I have a sunvic 207xl programmer and the central heating system works perfectly when switched on. However when the hot water side is switched on seems to work intermittently. The red power light seems to come on and switch off randomly. I have set the setting to always on to see if I could...