Drayton digistat +RF and Valiant ecoTEC boiler

[simonjudd]

Good morning everyone,

We have a Valiant ecoTEC plus boiler with a Drayton digistat +RF thermostat and digistat scr receiver installed.

All seemed to be going well until the area had a power cut last week and now the heating won't go above 20 Celsius.

I have set the thermostat to 22 degrees. The green light on the SCR stays on permanently but the boiler doesn't seem to kick the heating any higher. The valiant is on (rather than on timer at the moment) and it is going though the 'Anti cycling mode' constantly, and the thermostat is permanently saying that it is transmitting ... But the heat won't go higher than 20 degrees.

I have recommissioned the Drayton + RF and the digistat SCR, and they seem to be communicating fine, so has anyone got any ideas why the temperature won't get any higher?

 

[jackthom]

Hi, do the radiators ever get nice and hot or is the boiler just running for a short spell with the water temperature rising rapidly (on it's front panel display) and then overshooting the set water temp and switching off for a while ?

If so what is the max water temperature when this happens?

 

[simonjudd]

The radiators are getting hot, but the temperature is not getting above 20 degrees.

According to the display on the boiler, the radiators are set to 54 degrees, the boiler kicks in around 46 degrees and then turns off at 59 degrees.

Should I just up the temperature of the radiators on the boiler?

 

[simonjudd]

Bit of an update, I have upped the boiler radiator temperature to 75 degrees, now the thermostat goes up to 21, but no further!

Any ideas?

 

[jackthom]

75C should be more than enough to get all the radiators too hot to hold.

Make sure the radiator where the room thermostat is located is not being controlled by a thermostatic valve and that it is getting very hot from top to bottom.

 

[simonjudd]

Thanks Jack,

It took a while, but eventually we reached the 22 degree mark. The radiator in the room is getting roasting now, I think it was the boiler temperature.

Thanks

Simon