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April HermanJul 25, 2025
Why is the “Cool On” or “Heat On” flashing on my Honeywell Home RTH111B1024/E1 Thermostat?
- MMaria FlemingJul 25, 2025
The “Cool On” or “Heat On” is flashing because the compressor protection feature is engaged. To resolve this, wait 5 minutes for the system to restart safely. This protects the compressor from damage.