Troubleshooting - Honeywell Home T10 Pro RedLINK Manual

T10 PRO SMART THERMOSTAT WITH REDLINK

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.
• Make sure power switch for heating & cooling system is
on.
• Make sure furnace door is closed securely.
• Make sure the C wire is connected.
Heating or cooling system does not respond
• Press Menu > System Mode > Heat > Done to set the
system to Heat mode. Make sure the desired
temperature is higher than the indoor temperature.
• Press Menu > System Mode > Cool > Done to set the
system to Cool mode. Make sure the desired
temperature is lower than the indoor temperature.
• Check circuit breaker and reset if necessary.
• Make sure power switch for heating & cooling system is
on.
• Make sure furnace door is closed securely.
• Wait 5 minutes for the system to respond.
Temperature settings do not change
1. 1. Verify the thermostat is set to the correct mode.
Press menu-mode to change mode setting.
2. If the display indicates "screen locked" when you
press the up or down arrow, you can unlock the
screen by selecting menu-security settings.
Resideo Inc., 1985 Douglas Drive North,
Golden Valley, MN 55422
www.resideo.com 33-00462—01 M.S. 08-19 | Printed in United States
This product is manufactured by Resideo Technologies, Inc., Golden Valley, MN, 1-800-633-3991
©2019 Resideo Technologies, Inc. The Honeywell Home trademark is used under license from Honeywell International Inc. All rights reserved.
3. The thermostat may be preventing you from chang-
ing the set-point above or below a certain setting
because of installer configured minimum and maxi-
mum settings. See the ISU settings for 4100 on page
22.
Default minimum and maximum settings-
• Heat: 40 °F to 90 °F (4.5 °C to 32.0 °C)
• Cool: 50 °F to 99 °F (10.0 °C to 37.0 °C)
Aux heat runs in cooling
• For heat pump systems, verify there is not a wire
attached to W on the UWP.
Cool runs with a call for heat
• For heat pump systems, verify there is not a wire
attached to W on the UWP.
Cooling runs below set-point:
Cool should never run unless the display is solid blue and
shows "cooling to" rather than "cool to".
If ISU 9000 is set for AC with low speed fan or AC with high
speed fan, the T10 can run cooling up to 3 degrees below
set-point when humidity is high. It will cool 1 degree below
set-point for approximately every 4% RH above the
dehumidity setting.