Had Worcester Bosch boiler installed recently. Also a Drayton Digistat + RF Wireless System Room Thermostat. Didn't have room thermostat before. Programmer wasn't replaced it is an acl Lifestyle Model LP 112. Both the HW and CH on the programmer are set to come on twice a day and do so but the boiler fires up frequently and the HW light comes on outwith the set times. Installer says the programmer is faulty but it worked perfectly before the installation. Can anyone shed light on this?