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It’s 28mm flow and return. It’s an open gravity fed system, but circulation pump with a 3 way valve. So, HW is pumped on that circuit. 2 CH loops and then he HW loop.

The boiler is a grant vortex oil. It’s set to 75%, which is around 70c. It’s the one part of the system that is fully serviced and in excellent condition. I haven’t noticed it cycling, but I’ll carry out diagnostics tonight and I’ll measure flow and return of coil, and also properly measure top...

Okay, on cc3 it’s at 45 watts.

On cp3 it is showing 33 watts

This is the one. https://www.tridentpumps.co.uk/product/energy-efficient-pump/ It shows the watts/litres/

Yes, cp3 is giving 30-35 litres/minute flow rate. The difference in temp between too and bottom of tank is more like 25c or greater. I’m tempted to drain the tank and crack it open to see how badly it’s scaled up etc. it’s an old open system and the CH was in a shocking state last year before we...

Thanks, not heard of EPH before, I’ll go look. I was reading another post on here about flow rate. Am I right thinking if the flow rate from the HW pump is too slow, then the entire coil won’t get hot, only the top. That way, only the top of the tank gets hot. If the flow is increased, then the...

Thanks. Yes, the HW turns on and off when adjusting the stat, but it only really registers right down the bottom of the measurements. So I know electrically, it’s working. I’m just perplexed as to why I need to be setting it almost off to get the temps of the taps down.

Mechanically, the 3 port head is operating properly. My multimeters broke, so I’ll get a new one as well as a water temp guage and try further.

Yes, that’s the old ht3, the new one is slightly different with an extra, off position but right at the bottom. You see the different screw position. Everything else is the same, except the extra off. It’s an extra hrs click, not a marking. You see how low the setting has to be for it to...

When I meant permanently off, it’s the Drayton ht3, and the new one has a final click for 0, that is a complete ‘off’.

Thanks… So I can confirm that CH thermostat doesn’t affect HW. All wiring is now correct, and tight, and lines up with normal Y plan schematics. 3port valve body is working and free. 3port mid position head is new, and wired correctly. Tank thermostat is new and wired correctly. When tank...

So, checked and fixed all wires. All are lined up as they should be and match the y wiring diagram. However, HW still doesn’t switch off. Have set new tank thermostat to 50, which is lowest before permanently off ( when I turn permanently off, it does switch heating off). The boiler and pump are...

Thanks. After further troubleshooting, I might have found the problem. The satisfied is loose and not connected in the junction box, so not telling HW off in the controller. I’ll reconnect and try again. 3 port valve cable is black, bottom left. The grey is connected at the bottom of the chock...

Hello. Drayton HT3 tank thermostat wiring? Common, call for heat, satisfied. Simples! Just swapped thermostat out as old was faulty. Think there’s also a wiring issue? Satisfied seems permanently live. HW is off on controller. When plate at back depressed, common turns live so circuit is...