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The Lr and Ls terminals, where do they actually go into the
the Lr and Ls terminals, where do they actually go into the logic combi 30+ using this s plan https://www.ukunderfloorheating.co.uk/wp-content/uploads/2016/07/S-Plan-Zone-ValveNEW-1.pdf and existing thermostat siemens rcr10 433 … read more
Andrew Smith
Andrew Smith
Engineer
Vocational, Technical or Trade Scho
3,792 satisfied customers
I have a Vaillant thermocompact that has an intermittent
I have a Vaillant thermocompact that has an intermittent startup problem showing no heating demand. there is no thermostat in the house just TVR's on all but one Rad. It is also plumbed to a storage H… read more
Andrew Smith
Andrew Smith
Engineer
Vocational, Technical or Trade Scho
3,792 satisfied customers
I have a Vaillant Ecotech Plus 630 that won't fire up. There
HiI have a Vaillant Ecotech Plus 630 that won't fire up. There was a drop of pressure, probably due to a plumber doing some work in my bathroom closing the main water supply. I have filled the boiler … read more
James Inch
James Inch
Pool Plant Operator
85 satisfied customers
I have status code s30 on my vaillant ecotec plus 630. All
I have status code s30 on my vaillant ecotec plus 630. All the guidance I have seen suggests the lack of demand for heat is due to a faulty thermostat but the boiler only provides hot water. We have a… read more
Andrew Smith
Andrew Smith
Engineer
Vocational, Technical or Trade Scho
3,792 satisfied customers
I have a vaillant combi boiler and a Siemens remote sensor.
Hello I have a vaillant combi boiler and a Siemens remote sensor. I am getting hot water, but when I set the sensor to run and auto and increase the temperature for the radiators to turn on the boiler… read more
Andrew Smith
Andrew Smith
Engineer
Vocational, Technical or Trade Scho
3,792 satisfied customers
I've got a call for heat on my thermostat and my boiler is
I've got a call for heat on my thermostat and my boiler is providing hot water but the radiators are not coming on… read more
Andrew Smith
Andrew Smith
Engineer
Vocational, Technical or Trade Scho
3,792 satisfied customers
I have the same problem re the RCR10/433-gb unit. It has no
I have the same problem re the RCR10/433-gb unit. It has no test or reset buttons on the back. I cannot get a green light either.… read more
Andrew Smith
Andrew Smith
Engineer
Vocational, Technical or Trade Scho
3,792 satisfied customers
my vailliant ecotech pro 24 is not working. it is showing a
my vailliant ecotech pro 24 boiler is not working. it is showing a fault code S.30 which is described in the manual as, No heating demand from external controls (clamp 3-4 open). there are no lights l… read more
Andrew Smith
Andrew Smith
Engineer
Vocational, Technical or Trade Scho
3,792 satisfied customers
Hi Rick, I have a Baxi boiler with a Siemens RDJ10RF controller
Hi Rick, I have a Baxi boiler with a Siemens RDJ10RF controller wirelessly linked to a Siemens RCR10/433. The hot water is working but the heating isn't coming on in any mode. I'm trying to set to a c… read more
Andrew Smith
Andrew Smith
Engineer
Vocational, Technical or Trade Scho
3,792 satisfied customers
Hi My Vaillant ecoTec plus 831 R1 combi boiler serves 3
Hi My Vaillant ecoTec plus 831 R1 combi boiler serves 3 demands: a water underfloor heating circuit (in the kitchen), hot water on demand for taps, and the radiator central heating circuit. All three … read more
Andrew Smith
Andrew Smith
Engineer
Vocational, Technical or Trade Scho
3,792 satisfied customers
I have a rcr10 433 the red light was flashing so I pressed
I have a rcr10 433 the red light was flashing so I pressed the reset button there are no lights on. The boiler is working for hot water, after the outlet pipe was cleared but the receiver does not app… read more
Mike R.
Mike R.
3,031 satisfied customers
Hi, My thermostat (siemens RDH10 RF ) is working but the
Hi, My thermostat (siemens RDH10 RF ) is working but the receiver is not (RCR10/433) There are no lights on so thus I have no central heating. I do have hot date though which suggests the heating shou… read more
Andrew Smith
Andrew Smith
Engineer
Vocational, Technical or Trade Scho
3,792 satisfied customers
my rcr10/433 receiver has NO lights on. i have hot water but
my rcr10/433 receiver has NO lights on. i have hot water but no heating. batteries in the rdj10rf are fine. even the overide button does not work. have trie ALL combinations of reset/learn etc. to no … read more
Andrew Smith
Andrew Smith
Engineer
Vocational, Technical or Trade Scho
3,792 satisfied customers
my rcr10/433 receiver has NO lights on. i have hot water but
my rcr10/433 receiver has NO lights on. i have hot water but no heating. batteries in the rdj10rf are fine. even the overide button does not work. have trie ALL combinations of reset/learn etc. to no … read more
Andrew Smith
Andrew Smith
Engineer
Vocational, Technical or Trade Scho
3,792 satisfied customers
my boiler(oil) is not firing when the hot water is switched
my boiler(oil) is not firing when the hot water is switched on but my c/heating does fire up the boiler and when c/h is on when i switch on the water it kills the boiler… read more
Rick Ridley
Rick Ridley
UK Heating Engineer
30 years on the tools
1,561 satisfied customers
Hello. My boiler a Vaillant ecotec pro 28 reports error
Hello. My boiler a Vaillant ecotec pro 28 reports error code S.31 Central heating thermostat knob turned off or no heat demand by the eBUS control unit. All of my Central heating radiators are turned … read more
Andrew Smith
Andrew Smith
Engineer
Vocational, Technical or Trade Scho
3,792 satisfied customers
I recently drained the heating system down to remove a radiator,
I recently drained the heating system down to remove a radiator, when I refilled it and then bled it I cannot get any hot water. I can hear the pump start but the boiler won't fire up. The immersion w… read more
Rick Ridley
Rick Ridley
UK Heating Engineer
30 years on the tools
1,561 satisfied customers
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Disclaimer: Information in questions, answers, and other posts on this site ("Posts") comes from individual users, not JustAnswer; JustAnswer is not responsible for Posts. Posts are for general information, are not intended to substitute for informed professional advice (medical, legal, veterinary, financial, etc.), or to establish a professional-client relationship. The site and services are provided "as is" with no warranty or representations by JustAnswer regarding the qualifications of Experts. To see what credentials have been verified by a third-party service, please click on the "Verified" symbol in some Experts' profiles. JustAnswer is not intended or designed for EMERGENCY questions which should be directed immediately by telephone or in-person to qualified professionals.

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