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it sounds like this is in auto mode,
The AES/AUTO mode of operation takes priority over all other operating modes. If more than one mode
selector button (2), (3) or (4) is in the down position, the priority is from left to right.
When operating in this mode, the AES/AUTO mode indicator lamp (A) will illuminate. In this mode the
control system will automatically select the energy source with AC having top priority, DC second priority
and GAS third priority. If the control system has selected a particular energy source such as AC, and then
it becomes unavailable, it will automatically seek out the next available energy source.
Press the AES/AUTO mode selector button (2) to the DOWN position. Indicator lamp (A) should illuminate.
Indicator lamp (D), (E) or (F) should also illuminate indicating which energy source the control has
Press the TEMPERATURE SELECTOR button (5) until the lamp at the desired position is illuminated.
try thtis. Let me