Honeywell RTH5100B Quick Installation Manual page 25

Non-programmable digital thermostat

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Troubleshooting

Heating or cooling

system does not

respond

"Cool On" or "Heat

On" is flashing

• Press SYSTEM button to set system to Heat. Make

sure the temperature is set higher than the Inside

temperature.

• Press SYSTEM button to set system to Cool. Make

sure the temperature is set lower than the Inside

temperature.

• Check circuit breaker and reset if necessary.

• Make sure power switch at heating & cooling

system is on.

• Make sure furnace door is closed securely.

• Wait 5 minutes for the system to respond.

• Compressor protection feature is engaged. Wait

5 minutes for the system to restart safely, without

damage to the compressor.

RTH5100B

69-2329ES—03

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