Honeywell RTH9580 Wi-Fi - Troubleshooting

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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.
• Makesurepowerswitchatheatingandcoolingsystemison.
• Makesurefurnacedoorisclosedsecurely.
• MakesureCwireisconnected(seepage11).
Cannot change
system setting
to Cool
• CheckthatSystemSetupscreen“Yourthermostatcontrols”or“Your
system type” is set to match your heating and cooling equipment (see
page 65).
Fan does
not turn on
when heat is
required
• CheckthatSystemSetupscreen“Yourfancontrol”issettomatchyour
heating equipment (see page 66).
“Wait” appears
on the screen
• Compressorprotectionfeatureisengaged.Wait5minutesforthesystem
to restart safely, without damage to the compressor.
Troubleshooting