1. P

    Swapping Honeywell BDR91 Receiver with Tado Wireless Receiver

    Hi folks, have been a stalker of the forum for a while during my DIY journey, but I stumbled upon an issue which I couldn't find suitable answers for in my specific case I have a BDR91 receiver and I want to swap for a Tado V3+ wired system. Problem is that I'm unsure which wires go where. In...
  2. G

    BDR91 Receiver replacement with Hive wiring

    Hi all, Would be greatly appreciated if you could help me with this: I have connected the cables in this order (single channel receiver). BDR91 N to Hive N BDR91 L to Hive L BDR91 A to Hive 2 BDR91 B to Hive 3 In the application/thermostat, the receiver does kick off when the central...
  3. S

    Wiring an external controller:

  4. J

    Hive Dual Channel To Replace Honeywell BDR91 & ST9400s

    Morning all, Apologies, I'm aware this set up has been discussed here before. I'm looking to replace my Honeywell BDR91, ST9400s and wireless thermostat to control heating and hot water (cylinder) with Hive dual channel. I understand the ST9400s and the Hive Dual Channel Receiver have...
  5. S

    Wiring an Evohome BDR91 to Hallway Thermostat - Which wires go where?

    Hello there, I am installing my Honeywell EvoHome in our new house and it should be easy. All I need to do is replace the Hallway Thermostat (Honeywell T6360B) with the Wireless Relay box (BDR91). However, I am not sure which wires from the old thermostat go into which places in the BDR91. As...
  6. D

    Hive Dual Channel replacing Honeywell BDR91 & ST9100c

    Hi, I would like to replace my existing Honeywell ST9100C HW controller and BDR91 CH receiver with a Hive dual channel receiver. The system has an immersion tank for the HW. The BDR91 is wired as follows: The ST9100C is wired as follows: These 2 cables go back to a 10 way junction box...
  7. D

    Wiring Heatmiser Receiver

    Hi, Am trying to replace the currently installed Honeywell BDR91 receiver with Heatmiser Slimline RF switch. But am confused with the wiring. In the BDR91 there are only 3 other points apart from the mains (A, B, C) but the Heatmiser has 8 (COM1 & 2, NC 1 & 2, NO1 & 2, LS, LR). Am not really...
  8. J

    BDR91 to Hive conversion advice

    Hi all! Our old thermostat controller isn't working anymore, so we are looking to do a DIY upgrade from the old Honeywell BDR91 to Hive. We would appreciate some advice from the experts on this forum! We have a "Vaillant EcoTech Pro 28" combi boiler, and I have attached the current BDR91...
  9. Julian Klm

    BDR91 to Hive - Combi Boiler

    Hi All, I just bought a Hive and want to double check the correct wiring. I have currently installed the Honeywell BDR91 (to Hive - Combi Boiler) like this: Would probably wire it as the following, but hopefully someone can confirm or correct the setup: Thank you!
  10. C4rlos81

    Vaillant ecoTEC plus 837, BDR91 to nest Heatlink

    Hi all, I have read through as many similar posts as I can in regards to my dilemma, I couldn't see anything that was similar to mine. I have a Vaillant ecotec plus 837 with a Honeywell BDR91 and CM927. The vaillant is connected by a UK mains plug as opposed to it being hardwired with a 3amp...
  11. W

    Drayton wiser hub install to replace Honeywell BDR91

    i’ve just invested in a Drayton Wiser smart thermostat and am considering whether this is something I can install myself. My boiler (combi) is less than 2 years old and is controlled by a wireless Honeywell thermostat at present. The receiver I need to replace is a Honeywell BDR91 wireless...
  12. B

    Wiring in a BDR91 to Combi Boiler

    Hi All, Just got my Evohome kit through the door the other day and was looking to get it up and running this weekend. My existing relay is also honeywell (R6660D / HC60NG) so should be a fairly straight forward swap out but whilst looking at the existing wiring I noticed a couple of quirks /...
  13. sambancroft

    Honeywell Evohome Installation Help

    Hi All, Firstly abit of background: I live in a 2015 built house, which has two thermostats (one in the living room, and one in the bedroom), and 10 radiators with two different fittings. I've identified that two of the radiators will need their TVR's replacing in order to be 'evohome...
  14. H

    Nest Thermostat 3rd Gen wiring- converting from Honeywell BDR91 relay box

    Hi I have a Vaillant ecoTec Pro 28 combi boiler which currently operates with a Honeywell wireless programmer and a Honeywell BDR 91 relay box. I'm thinking of replacing the Honeywell controls with a Nest 3rd Generation Thermostat and trying to determine whether or not i need to get it...
  15. A

    glow worm 35c boiler with a honeywell bdr91 smart wireless thermostat

    hi there, I currently have a glow worm 35c boiler in my home, i'm trying to fit a BDR91 thermostat. the wiring diagrams aren't the clearest in the world. can someone help please? I have read loads of threads about the Wiring. do I have a new power source to the thermostat? my boiler has...
  16. D

    Replacing Danfoss RX-1 with Honeywell BDR91 to Worcester Bosch Greenstar

    Hi folks, Thanks for taking a look here. We have a Worcester Bosch Greenstar 30CDi Combi boiler, and a Danfoss RX-1 unit as relay to it. Existing Wiring: From what I can work out from the wiring guides for the Honeywell BDR91 and the Greenstar, I need to do the following: I believe I've...
  17. E

    Wiring up a Wireless Thermostat

    Hi, I can't get my head around this and I'm wondering if any of you can help me out. I currently have a Worcester Heatslave 15/19 Oil Boiler, it is controlled with a Programmer in the Kitchen, where I can tell both the Hot Water and Heating to come on, and set times for weekdays and weekends...
  18. N

    No heating because of BDR91?

    Hi there, new to the forum and need some help. I have a Worcester Combi boiler 42cdi, with underfloor heating set up. We currently have hot water but no heating. The British Gas man has been round and said it is to do with the BDR91 relay which is tripping out when it tries to trigger the...
  19. A

    Switching Honeywell R6660D with BDR91 wireless relay box

    Combi boiler was connected to a Honeywell R6660D wireless relay box: N - Blue L - Empty L - Brown A - Empty B - White C - Black D - Empty E - Empty This has been swapped out and replaced with a Honeywell BDR91 wireless relay: N - Blue L - Empty L - Brown A - Empty B - White C - Black The...