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PostPosted: Mon Sep 27, 2010 8:53 am 
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Hi, please can some one help me????

I own a Vaillant eco tec plus Combi boiler that both provides my central heating and hot water.
The hot water works fine pressure all ok, but my central heating is not working? the digital thermostat (Drayton Digistat+2rf) i have is working fine. There are no faults showing on the boiler display. the only thing not showing is the radiator symbol (Heating mode active symbol)?

Many Thanks Alison


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PostPosted: Mon Sep 27, 2010 1:49 pm 
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When you say the digistat is ok is the green light (top one) on the receiver actually lit?

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PostPosted: Mon Sep 27, 2010 5:21 pm 
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If the radiator symbol is not showing, then it seems the boiler is not getting a call for heat.

When you think the boiler should be on for heating, press the 'i' button and tell us what 'S' code is displayed.

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PostPosted: Mon Sep 27, 2010 9:43 pm 
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Yes the green light is on the receiver, i have gone through all the checks with the manual to pair up as below. When i i get down to No 3, override button the green light comes on but the boiler will not fire up?
And the code on the boiler is displaying S30. I can press both the +- buttons to fire up the boiler but this only works for a short time.

Thanks Alison

No 1. Turn off the power supply to the Digistat SCR (receiver unit)
and leave for 5 seconds.
2. Turn on power to SCR unit and check red light is on.
3. Press override button No.2 and check the green light comes
on and boiler fires.
4. Press & hold down button No.1 (Keep depressed), then
press No.2 and keep depressed. {The Red LED light will flash
a couple of times and then it will go out}
5. Now release both the buttons – {the two LED lights should
come back on}
6. Get the Digistat+2RF/+3RF unit and stand two metres away
from the SCR unit with the Digistat+2RF/+3RF unit in your hand.
7. Remove the battery cover and fit the batteries.
8. The Red LED light on the SCR will now flash for approx. 7
seconds.
9. This confirms that the radio signal is being sent and
received.
10. The Digistat+2RF/+3RF and the SCR are now successfully
linked by a dedicated RF address.
11. Install the Digistat+2RF/+3RF as follows:
COMMISSIONING THE DIGISTAT +2RF or
+3RF ‘WIRELESS SYSTEM’
IMPORTANT: MULTIZONE


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PostPosted: Mon Sep 27, 2010 10:43 pm 
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S30 is 'no call for heat from external controls'.

I think the problem lies with your room stat/programmer etc.

If you feel competent, you can switch off ALL power to the boiler and heating system, open the boiler up, remove the pcb cover and link terminals 3 & 4 on the pcb. Turn boiler back on.

If the boiler fires, this then proves it to be an external control fault.

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For this message the author gas4you has received gratitude : Alisonc76
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