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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Honeywell T8131C thermostat with error code of "16E pm Lo",(

Customer Question

Honeywell T8131C thermostat with error code of "16E pm Lo",( 'E' missing top bar).
JA: Just to clarify, do you think this is a larger HVAC problem, or something specific to the thermostat?
Customer: Thermostat, heating or cooling go on when switch moved to them.
JA: Do you plan on doing the work yourself?
Customer: Yes, if feasible.
JA: Anything else we should know to help you best?
Customer: I tried the replacement of batteries already.
Submitted: 10 months ago.
Category: HVAC
Expert:  airheatman replied 10 months ago.

Try removing batteries and installing them backwards for five seconds.Then put them back correct and let me know if thermostat resets.