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You are correct about the "er" message. Best bet is to check your user manual for error codes and then take it from there. If nothing in book it is possible that the answer might be on manufacturer web site.
Could be issue with thermostat itself if the other zone is being cooled properly.
homeappliance.manualsonline.com > ... > Carrier Thermostat Appliance manuals and free pdf instructions. Find the user ... Carrier 33CS450-01 Thermostat User Manual. Page 1 ... Carrier Corporation 04/06. Use with most ...
Are you trying to run your cooling now? I'm guessing you have a carrier thermostat and that's where this is displaying. It's been awhile since I've came across one but to my vague reculiction that code indicates the outdoor sensor detects low ambient them temperatures which in turn will not allow your air conditioner to run which would make sense this time of year. If you want to run cooling in below 60 degrees temps you must add a "low ambient kit" this shuts the fan down outside to build up higher head pressure without doing this you will just ruin your ac but in your case it won't let you. Google up your Tstats model number and codes if that's not your situation.
Clean Filter Feature - The thermostat will display the CLEAN FILTER indicator when it is time to change the filter. Press the Reset Filter button to restart the timer after the filter has been changed or cleaned. Helpful?
check filter is a setpoint left in the program of the thermostat it does not effect the thermostat peformance check carriers web site or google that number may come up but that reminder does not effect the function .