Honeywell RTH221B Owner’s Manual

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Troubleshooting

If you have difficulty with your thermostat, please try the following suggestions.

Most problems can be corrected quickly and easily.

Display is

blank

• Check circuit breaker and reset if necessary.

Heating

or cooling

system does

not respond

• Set system switch to Heat. Make sure the temperature is

set higher than the Inside temperature.

• Set system switch to Cool. Make sure the temperature is

set lower than the Inside temperature.

• Wait 5 minutes for the system to respond.

Temperature

settings do

not change

Make sure heating and cooling temperatures are set to

acceptable ranges:

• Heat: 40° to 90°F (4.5° to 32°C).

• Cool: 50° to 99°F (10° to 37°C).

“Cool On” or

“Heat On” is

flashing

• Compressor protection feature is engaged. Wait 5 minutes

for the system to restart safely, without damage to the

compressor.

“Heat On” is

not displayed

• Set the System switch to Heat, and set the temperature

level above the current room temperature.

“Cool On” is

not displayed

• Set the System switch to Cool, and set the temperature

level below the current room temperature.

For assistance with this product, please visit

http://honeywellhome.com/support

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Honeywell RTH221B Home 1 Week Programmable Thermostat