What do the letters that show up in the control pearl window i.e. A or C mean?
Answer Hello Johnson. The A in the display is reminding you to clean the filters 49001046A in the unit. The C in the unit id reminding you to change the carbon filters 49001168A in the unit. To reset the unit, you will press and hold the + key, until the C disappears. You will press and hold the - until the A disappears. Hope this helps.