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I have a Siemens RDJ10RF/RCR10/433 and a Vaillant ecotech…

Hello, I have a Siemens...
Hello, I have a Siemens RDJ10RF/RCR10/433 and a Vaillant ecotech Plus 624 boiler.
I have trouble getting the heating working. This has been an ongoing issue for a week.
The megaflo immersion is providing hot water for the taps but there is no demand to the boiler for it to fire and the radiators do not get hot water.
The boiler display s S.30 code (no demand) Although the RCR10/433 has a green light indicating a connection with the controller. I replaced the thermostat and receiver 2 days ago and it was working ok until constant was turned off. It has worked intermittently since. There are two 2 port valves on the system which operate correctly when they are asked electronically.
What could be the issue?
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Customer reply replied 4 months ago
Currently hot water to taps but no heating. Thermostat is paired with the receiver but no demand to boiler. I have heard that the thermostat can be bypassed with the wiring. I will add a picture on the receiver which then goes off to the Megaflo box.
Answered in 2 hours by:
3/10/2018
Andrew Smith
Andrew Smith, Engineer
Category: UK Plumbing
Satisfied Customers: 3,781
Experience: Domestic Gas, Commercial Gas, LPG, Unvented Hot Water, Part P Electrical, Commercial Catering
Verified
It is possible to put a link in the receiver box to see whether it is the stat or the boiler
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Customer reply replied 4 months ago
A link? Could you please expand.
Currently the heating is on, as I turned the electric off to the boiler for over a hour then turned it on again. This is a temp solution and I would like to nail the problem that stops it working correctly.

It should be quite simple.

Can you take the cover off the receiver and tell me what wiring you have and to what connections?

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Customer reply replied 4 months ago
The pictures of the receiver and the mega flow unit are on the attachments I added earlier. I have attached again.
To link out the stat take the cables from L1 and Lx into the same connection and turn back on.
It will be like the stat is out if the loop.
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Both together in either - as long as they are joined.
That links out the stat.
The only permanent solution would be swap the unit, replace it with a wired version or use something that runs on WiFi like a Nest.
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Customer reply replied 4 months ago
Thank you I have managed to bypass the thermostat. If I replace with a Nest system it seems that the Nest controller needs to be where my existing receiver is next to the immersion tank in order to wire it in?There is no thermostat wiring in the house as it was wireless.
the WiFi controller sits near the central heating wiring box.
The last one did controls the heating and hot water and took about 2 hours to fit.
It gives you control over an app - so anywhere.
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Customer reply replied 4 months ago
That means in my case the wifi controller and presumably thermostat is in a hot area next to the immersion tank upstairs in the bathroom. The boiler is downstairs in the kitchen. Surely the thermostat ought to be in the main living room?
Sorry if this is a dumb question.
As this shuts off all your heat it should be in the coolest place.
Once this had reached temperature then everything shuts down.
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Customer reply replied 4 months ago
Thanks I understand the Nest system now.
The bypass upstairs is not now working. I turned the heating off earlier as it was too warm, it will now not turn on and gives the s.30 code. I have not touched the wires. I’m so confused.
S30 is no demand again.
Perhaps we link out in the boiler instead and see what happens.
Do you have a timer also?
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Customer reply replied 4 months ago
I think I need an engineer to visit to determine the real issue.
That's fine or we can keep working backwards?
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Customer reply replied 4 months ago
Ok, the Boiler still displays s.30 with the stat linked out. Did you say we need to link out the boiler?
I’m not too sure how to do that.
Follow the stat wires back and drop a small wire link into the 2 connectors instead of the wires
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Ok.
1. Do the valves open?
2. It is the valves that fire the boiler.
3. The cylinder stat opens one
4. The room stat opens the other.
5. The lever becomes slack when the valve is open.
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Customer reply replied 4 months ago
The valves do open when it works and the boiler fires both the levers become slack. The micro switches seem ok.
I have not yet bypassed the boiler, should I still do this?
Customer reply replied 4 months ago
If I take out the fuse to the boiler and receiver for 5 mins and then reinsert the boiler fires.
If you are wired as an S Plan then either valve opening should make the boiler fire.
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Customer reply replied 4 months ago
It’s an S plan and you are correct either of the valves make the boiler fire. Currently it runs for 5/10 minutes when the fuse is out for 10 mins. The boiler then stops and reverts to s.30. It’s driving me crazy.
We need to check the valve is open when you get the s30 code?
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Customer reply replied 4 months ago
The valve is not open when the S30 code appears.
Ok - boiler ok then.
Perhaps we concentrate on the 2 port valve then.
We need to check for power at the valve when it should be open but isn't.
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Customer reply replied 4 months ago
Heating on currently. Both valves open.
Can you monitor until you get a s30 fault and see if the valve is shut- if it is then we need to check power
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Customer reply replied 4 months ago
Will monitor.
Ok.
Come back to me when you have monitored for a few hours
Andrew Smith
Andrew Smith, Engineer
Category: UK Plumbing
Satisfied Customers: 3,781
Experience: Domestic Gas, Commercial Gas, LPG, Unvented Hot Water, Part P Electrical, Commercial Catering
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