Honeywell RTH8500 - Troubleshooting

65 69-2715EF—07
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13).
Cannot change
system setting
to Cool
• CheckFunction 0170: System Type to make sure it is set to match your
heating and cooling equipment (see page 54).
Fan does
not turn on
when heat is
required
• CheckFunction 0180: Heating Fan Control to make sure it is set to match
your heating equipment (see page 55).
“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