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  1. G

    HW call won’t light boiler

    I bypassed the Drayton 722, for both CH and HW, by connecting the respective wires to the Drayton live terminal. In both cases the respective motorised valves opened and the boiler turned on. So, my conclusion is that the Drayton 722 has gone bad. I ordered a new 722 so it’s an easy fix...
  2. G

    HW call won’t light boiler

    CH LED only lights when CH is ON, and same for HW. What I find is that if I turn CH ON alone or HW ON alone, the respective red LEDs glow, but there’s nothing audible from the Drayton. But when I turn the second loop ON, which had been OFF, such that both are now ON, there is an audible click...
  3. G

    HW call won’t light boiler

    I confirmed the diagnosis, whereby with CH ON alone, or HW ON alone, the boiler sits idle at S.30, but when both are ON the boiler starts. The controller is a Drayton Lifestyle LP722 with honeywell thermostats. I've never thought the system worked properly, but for reasons different than what...
  4. G

    HW call won’t light boiler

    Ian, I appreciate your help! After much trial-and-error, I find that both valve levers are giving resistance when OFF, and both have no resistance when ON. I also found that the boiler would not fire with signal only from CH, rather it required signal from both CH and HW. This is the reverse of...
  5. SYNCHRONOUS MOTOR

    SYNCHRONOUS MOTOR

  6. G

    HW call won’t light boiler

    Thanks for the reply. Is it just replacing the synchronous motor, e.g. one of these? SYNCHRONOUS MOTOR by Gary Lapidus posted 25 Jun 2021 at 10:57 AM It looks like one can also buy complete replacement motorized valve heads, which I assume include the electric switch in the valve that signals...
  7. G

    HW call won’t light boiler

    Thanks Ian! Here are photos; I believe they are the "dimpled" with accessible/removable synchronous? The valves are as I found them. The sliders are both on "Open / Manual". At time of photo the CH was Off, which suggests the CH diverter valve incorrectly left in manual position, yes? Since...
  8. G

    HW call won’t light boiler

    I have a Vaillant ECO Plus, remote hot water cylinder, wired Honeywell S Plan with a Lifestyle LP722. This time of year I have CH set to OFF and HW set to twice per day. For the past day or two, the HW signal calling for heat doesn’t light the boiler. E.g., the boiler water was 19 C this...
  9. G

    I can't isolate (turn off) hot water to the house

    You guys are great! Let me be sure I understand. The pipe/valve on roof labelled “to cylinder red”; is that the “fresh” water supply for domestic hot water, and also providing water pressure (height of water) for the hot water? Is it the case that if I close that valve then the pressure of...
  10. G

    I can't isolate (turn off) hot water to the house

    The boiler has a loop that heats water in the cylinder. Maybe that’s not combi? I think the system has two motorised valves; one heat, one water.
  11. G

    I can't isolate (turn off) hot water to the house

    I'm trying to change a leaky isolating valve in the 1st floor bathroom basin, but I can't drive the hot water pressure to zero, and therefore can't remove the valve. I have a combi boiler in the vault, a hot water cylinder in the cupboard, and a water storage tank on the roof. I closed the "Hot...
  12. G

    Hot water Recirculation Cycle Problem

    Okay, I see. So you're saying that while one can wire the recirculation pump to turn on and off coincident with the DHW cycles, and that seems to be how mine was set up, you're saying that it is not an efficient way to go. PIR, I assume that's photo infra-red or motion sensor. That's a great...
  13. G

    Hot water Recirculation Cycle Problem

    Thanks for your help on this. I know nothing about the topic but am always trying to learn. I'm under the impression that the power to the hot water recirculation pump is a ‘switched’ Live not a ‘permanent’ Live, initiated by the LP722, and that the associated wiring is within the junction box...
  14. G

    Hot water Recirculation Cycle Problem

    There is one wire to the circulation pump, which leads from the Honeywell junction box. I assume there is no controller in that box. The pump itself does not appear to have any control/timer dials, and there are no other signal wires leading to the pump, e.g., from a thermocouple, so I have to...
  15. G

    Hot water Recirculation Cycle Problem

    I appended to my post; thanks
  16. Recirc1

    Recirc1

    Drayton and Honeywell controllers
  17. Recirc2

    Recirc2

    Grundfos hot water recycle with two loops
  18. HW recirculation loop

    HW recirculation loop

  19. G

    Hot water Recirculation Cycle Problem

    My house has a low pressure gravity system. It uses a Drayton Lifestyle LP722 timer w/ two HW (hot water) and CH (central heating) cycles each, and a Grundfos UPS 15-50 hot water recirculation pump. The electrics are wired into a Honeywell junction box. There two hot water loops, one for the...
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