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Ask Rick Ridley Your Own Question
Rick Ridley
Rick Ridley, UK Heating Engineer
Category: UK Plumbing
Satisfied Customers: 1561
Experience:  30 Years on the tools, now retired, Ex CORGI
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I have a Drayton LP722 controller and a Salus wireless room

Customer Question

I have a Drayton LP722 controller and a Salus wireless room thermostat. We used to run our heating system using the Central Heating side always on controlled only by the room thermostat. This worked fine. Recently we have added hot water heating to the system and now it seems the system has a mind of its own. The hot water is timed and the central heating is on all the time and we hope controllable by the room thermostat. Unfortunately the heating appears to come on and go off at odd times and independently of the room thermostat. We have tried various settings of timed and un-timed on both water and central heating. Nothing appears to work in a predictable fashion. Can you suggest anything?
JA: How long has this been going on? And how severe is the problem?
Customer: For several weeks since we had the hot water heating added to the system
JA: Do you plan on doing the work yourself?
Customer: If it is a simple configuration problem yes.
JA: Anything else we should know to help you best?
Customer: No
Submitted: 8 months ago.
Category: UK Plumbing
Expert:  Andrew Smith replied 8 months ago.

Are you sure it is wired correctly?

Has it worked properly at all since the changes?

Customer: replied 8 months ago.
We've had 2 heating/electrical engineers out who have verified it is wired correctly.It worked as we expected it should for about 3 days approximately. From a user perspective it's not rocket science. Both central heating and hot water have separately programmable timers and can be independently set to timed, off or on. The room thermostat (a SALUS unit) can independently vary the thermostat cut out temperature on a timed profile.As a good example of how crazy it is I was standing beside the boiler at 23:05 this evening and it fired up. The hot water side was timed to switch off at 18:30. The central heating thermostat drops to 10 degrees C at 22:30 and the room was at 20 degrees C and not calling for heat. There was no reason for the boiler to fire up. The splitter valve was to the Water side.Any advice would be gratefully received.
Expert:  Andrew Smith replied 8 months ago.

Do you have a multimeter?

It sounds like a problem with the clock or motorised valve, both are able to fire the boiler.

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