Fault Diagnosis/ Battery Replacement - Worcester DT20RF Instruction Manual

8_716_115_495a 9/2/09
DT20RF PROGRAMMER
INSTRUCTION MANUAL
8 716 115 495a (02.2009)
11:49 Page 11
TAMPER PROOFING (All Models)
To tamper proof the product i.e. prevent
unauthorised adjustment of the product, set the
Min. and Max. (HI and Lo) temperatures to the
same desired value using the procedures above.
FAULT DIAGNOSIS (All Models)
If the display shows E1, the following faults could
have occurred:
1. Internal temperature sensor has failed.
Replace the unit,
2. Ambient temperature is outside product
operating temperature range - 0°C to 50°C.
When the ambient temperature is back within the
operating range, the unit will function correctly.
BATTERY REPLACEMENT (All Models)
• When the batteries are getting low (approx. 30
days battery life remaining) the battery symbol
will flash in the display, it is recommended to
change the batteries during this period.
• After approximately 30 days, a continuous battery
symbol only will be shown in the display and the
unit will remain OFF.
Remove the battery compartment by pinching the
tabs and withdrawing down. Replace the spent
batteries with 2 x AA 1.5V alkaline batteries
ensuring correct orientation. Replace the battery
compartment pressing fully home.
DIGISTAT ROOM THERMOSTAT
BATTERY REPLACEMENT
OPERATING & INSTALLATION
INSTRUCTIONS
9