Keeprite control shows F7; system may not respond to thermostat commands.

Safety first: Turn off power to the indoor unit before working on thermostat wiring.

• Step 1 – Remove thermostat cover: Gently pull the thermostat from its base and inspect the wiring.
• Step 2 – Tighten terminals: Ensure R, C, Y, G (and O/B if heat pump) wires are firmly attached and not shorting together.
• Step 3 – Check cable: Look for signs of damage where the cable enters the wall. If multiple conductors are available, you can move to unused wires if one is broken.
• Step 4 – Confirm thermostat settings: Verify the thermostat is configured for the correct system type (cool-only or heat pump) and number of stages.
• Step 5 – Test with jumper (advanced DIY): With power off, you can temporarily jumper R to Y and G at the indoor control board to see if the system runs without the thermostat. If it does, the thermostat or cable is likely faulty and should be replaced.