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  1. R

    Wiring a 2 port valve on a hive system

    Good afternoon Im in need of some assistance on a job. A new central heating system is being installed (previously storage heating) and the customer has purchased a hive multizone kit. She wants to control her heating up stairs and downstairs seperate so would need zones valves installed. I...
  2. littlespark

    Possible fault with motorized valve

    I've been phoned by a customer who says his central heating pump is running almost constantly, whether his heating is on or not. (oil fired Worcester system boiler) Its not my usual area of expertise, but im thinking its possibly the motorised valve sticking and not releasing the switch that...
  3. J

    Power Consumption of Solenoid Valve

    I have a 24VAC 50-60Hz solenoid valve that has a power consumption of 125VA (Pull in) and 12VA (Hold in). This is connected to the output of a 230v to 24VAC transformer, however the secondary side of the transformer has two 75VA rated power outputs and the solenoid valve is only connected in...
  4. K

    Shower digital mixer valve compatibility with regular fittings

    I have a pretty basic question on suitability of a shower digital mixer valve. Checked with the the manufacturer Mira, who insisted that it should only be used with their shower heads, etc. Asked why, looked around, etc but can't seem to find a clear answer why. Basically I have read the manual...
  5. A

    Domestic 3 way valve Advice needed please

    Hi New to this forum. A DIYer but not one that messes about with electrics but this question is just for interest. We have just moved to a property and I am trying to sort out the heating system. 1 Downstairs is a hot air system which is totally outdated and fails to heat the upstairs 2...
  6. A

    3 Port valve actuator

    Hi just looking to see if anyone has seen these particular actuators in 24V? there are no details on the actuator I have and it isn't motoring I suspect that during the course of a recent panel upgrade someone has sent a 24v supply to the actuator that I assume is 240v.
  7. F

    New install. Is there an way to lengthen zone valve wiring.

    Evening all. This afternoon I've been have a look at the heating system install at a recent rewire. During first fix the wiring center location was agreed with the plumber. It's an S-plan with ufh, however the zone valves are located 4m apart so neither of the standard zone valve cables will...
  8. M

    Electrician Relpol Relay 8 pin with a zone valve and circulating pump

    I have some problem to hook up a circulating pump with a zone valve and 1 thermostat to control it, can you help me to hook up this correctly.
  9. markythesparky

    Very strange Zone valve problem

    Hi guys, I have a really odd one for you all. About four years ago we installed a heating systems for a swimming pool using various items but the main part of the heating was a Honeywell zone valve controlling the boiler. The valve was controlled in the usual way via a programmer and stat...
  10. P

    EcoTec Plus 424, VR66, VRT350F - Y system 3 port valve problem

    Hello, I am new here but desperate for help as this is first time I am stuck on regular boiler Y system wiring. I have installed EcoTec Plus 424 with clipped on VRT350F and control centre VR66. I have wired all as requested in manual and get problem with 3 port valve. It get's stuck in either HW...
  11. J

    Safe use of an old valve radio

    Apologies if I'm posting this question in the wrong forum. I have an old valve radio that has been rewired internally so is basically sound. The problem is it has no provision for a protective earth, the internal chassis is wired to neutral (was live before rewiring!) and it is far from double...
  12. R

    won't install new cooker without new extraction!?

    Hi all, We have a problem replacing a gas commercial cooker, it's in a small commercial setting (a care home). We just want to swap the old cooker for a brand new equivalent but are being told that no one will do the swap/install unless we also install a canopy extracting externally (rather...
  13. dlt27

    Underfloor heating help

    Hi, hope somebody can help. I am currently wiring a new wet underfloor heating system for builder. The plumber has fitted a 2 port valve and the pump that is part of the manifold. The existing system is a y plan. I was going to leave existing system how it is and fit a wireless programmable stat...
  14. A

    Nest 3G wiring help

    Hi all, this is my first post so please be kind. I installed a Nest thermostat a few months ago I have a gravity fed system powered by a Baxi Bermuda Back Bolier, I have a Honeywell 4043 2 port valve, I based the insatallation around a c plan as the wiring appeared to follow this logic although...
  15. V

    Please can anyone help a DIY guy? ...CH problem....

    Good morning! I have a problem with my central heating system…..and am wondering if anyone can help. The system: 1. 15 year old detached house, with a 15 yr old Honeywell Y Plan CH system, which to all extents and purposes works FINE. 2. Boiler is a traditional ‘IDEAL Classic’ boiler, fitted...
  16. N

    Heating and hot water only work independently...

    Hi there, Just after a bit of advice for a family members central hesting system. They have an old style Centroller 3000 controller which controls the central heating and hot water. The system is a back boiler (not a combi) with a hot water tank, pump and a honeywell 3 port valve. Central...
  17. P

    Honeywell wireless stat DT92E

    hi guys, customer has no thermostat for his heating so he brought a Honeywell dt92e. I am trying to install it but can't link it up with the programmer (2 channel Drayton) I have wired the stat up with a perminant live and it fires the boiler. But I can't get it to work properly with a...
  18. M

    S plan not firing boiler for hot water

    Hello all! I'm a plumber and have a customer where the s plan is working fine for both zones (ground floor, 1st floor + cylinder) but not firing the boiler when hot water demand from the cylinder is operated. 2 port valve opens and pump runs but boiler shows no demand for heat. Any ideas why...
  19. astormatt

    Pumps and Relays

    Hi all I am working on a job and I am having trouble getting my head around it. Normal systems are fine but this is causing me a headache. It is an S plan with an additional pump so both the DHW and CH have a pump and a valve, I know that the pumps have to be split due to it back feeding but...
  20. P

    Multiple Pumps on Heating Systems

    Hi all, Up until now I have mainly been dealing with bog standard Y and S plan heating systems with single pumps albeit sometimes adding smart control systems etc but in the last week I have come across a couple of installations where there are multiple valves and pumps in the system and I am...
  21. P

    British Gas UP2 failing to turn on Central Heating except when Hot Water is on

    OK, so I'm not a plumber but have a fairly good idea how this system works. I'm not alone with this problem either, there has been a similar post but it's old and doesn't have a resolution - though they have a temporary fix that doesn't work for me... Boiler: Baxi Solo 15HE Controller: BG UP2...
  22. A

    help to wire combi boiler for underfloor heating and house radiators

    Hi there. Major cyber pint for anyone that can help me with this problem. I have a vokera vision c combi boiler( which has volt free connections) that has to do the house radiators and one room for underfloor heating. There is one motorised two port valve for Radiators and one for the...
  23. D

    Adding underfloor heating to a s-plan system

    I am doing the electrics for an extension, part of which is to add a wet underfloor heating system. The current heating is s-plan, the boiler has a pump overrun. The plumber has put in a 2port valve and pump which feeds one zone on the UFH with a remote programmable theromstat. The...
  24. G

    heating controls

    Hi folks looking for a bit of advice, my boiler fires up when there is no call for heating or hot water, the motorised valves for the heating and hot water are both closed but boiler still comes on, i thought that when the motorised valves are shut this cuts off the suply to the boiler and...
  25. H

    HW valve stays on all the time, never switches off (Vaillant ecoTEC 637/VR65/VRT360)

    Hi I'm having issues with my hot water valve which remains on all day until the vrt360 goes on standby at night. Quick breakdown of my setup as follows: Vaillant ecoTEC 637 system boiler w/eBUS VR65 Control Center via eBUS VRT360 Controller via eBUS 2-port valve for HW wired to VR65 using...
  26. VoltzElectrical

    central heating systems help!

    I have no experience in the installation or fault finding of, central heating systems. I don't do, and have rarely done, domestic work. I volunteered recently to look at an elderly lady's situation whereby the system had been installed, then altered as the room stat was relocated from the...
  27. C

    12v reading on all the negative connections on 240v system

    Had a strange experience today. customets t&p valve keep blowing on their hot water heater (sealed pressurised electric immersion heater fed from a water pump, pped in from a 5000 litre holding tank ) thought it might be the faulty valve first, after testing that and it being fine I went onto...
  28. M

    Mid position valve and underfloor heating

    Hi all, just installed a polypipe under floor heating system to an existing Y plan, the valve is a V4073A,with this system the UFH stat should independently operate the UFHeating from the existing central heating, the snag is with the time clock off and the UFHeating stat on both the UFH & the...
  29. M

    Zone heating

    Hi, I've never really had much to do with heating systems so just wondered what you require for a 2 zone system. Would a 2 channel programmer such as a danfoss and just two room thermostats work? Would each room stat have to be programable or would this just be ok to have one at the main...
  30. sythai

    Another heating one...

    Just about to have my y-plan system at home changed for combi.... Going to be running 2 heating zones off this. Rather than spend out and buy 2 x new 2port valves, could I use the existing 3port valve (which was only replaced last year.) Tell me if I'm being dense or is there a way, just...
  31. S

    Heating Experts.

    Aunties heating is playing up, when she switches on the heating it's not firing up the boiler. Hot water switched on it's doing as it should & firing up the boiler. Had a brief look at it in the passing & when the heating is turned on there's 240v going to stat, returning from stat to valve...
  32. K

    Cylinder stat seems trip rcd

    Hi, My heating system is a myson apollo 30b with a 3 way valve etc. The other day wife said was a popping noise coming from kitchen where the programmer and boiler is , on investigation i have found when you turn down the tank stat which is a drayton hts 3 it when it gets below the temp and...
  33. P

    Underfloor heating via an s plan system

    hello Can anyone help am looking for a diagram I have an splan system with an extra valve for the u /f heating
  34. D

    worcester greenstar ri Y-Plan

    Hi all been called out to a boiler replacement with the above boiler. The problem is it wont run on heating only. have check wiring and all I can spot is that from controller there is no wire going from HW OFF to cylinder stat terminal 2 and grey on valve. Any thoughts and no spare cores in...
  35. T

    running more than one thermostat off one zone valve

    hello all im carrying out some work in a social housing building and they have problems with massive gas/electrical bills (£4000) a month, its a 3 storey building with 10 self contained bedrooms with en suit all with at lease one radiator in, they have recently had there boiler change by...
  36. G

    relay advice

    Hi, I m dealing with a heating system with 2 separate heat sources, a gas boiler and a wood burning stove. Both heat water and radiators but need to be able to work together or independently. The system has a motorised valve on heating and another for water. Firstly I need to be able to operate...
  37. J

    heating connections

    so I've got an s plan heating system in 3 story house, separate valve and stat for each floor, then the hot water valve and then another valve for underfloor heating in extension. altogether 5 valves. so this wont work on standard 10 way honeywell junction box right? I'm learning these systems...
  38. A

    central heating nightmare

    Hi I wonder if someone can help me I'm having trouble getting my heating and hot water to come on at the same time I've recently replaced the pump and the 3 port valve The old 3 port valve was a Honeywell mid position v4073a And the new one is siemens 3pmp-v22 but i cant seem to get it to...
  39. jackhammerJIM

    working with too many plumbers

    been doing a lot of subbing to a heating firm recently , teams of 4 plumbers and one spark installing biomass boilers . the latest load of nonsense from them ... spark : why is there 3 x 2 port valves on that s plan ? plumber : the 3rd valve is a safety feature for the unvented cylinder ...
  40. T

    Bosch proportional valve amplifier

    Been trying to find a decent datasheet on the internet to no avail. I am dealing with a Bosch type 2M2.5-RGC2. It's used to control the speed of a conveyor driven by a hydraulic motor. It has a variable voltage from a pot to terminal 2. What appears to be an enable signal to terminal 4. A 24v...
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