Question about Honeywell Electronic Programmable Heat/Cool Thermostat - CT3300A100 Heater

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My Honeywell 8501 thermostat has

My Honeywell T8501 thermostat has no display

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  • Cdaligou May 02, 2009

    My Honeywell T8501 Chonotherm IV Thermostat has no display and AC is not working. Do we need to replace the thermostat?

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Ceck for a full condensate pump or a float switch at the drain pan. In most cases we set these up that way to make you aware of a problem. Often the condensate pumps get slimy and need to be cleamed yearly.

Posted on Mar 12, 2009

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Posted on Jan 02, 2017

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Read more: How do I Unlock the Digital Display on a Honeywell RTH8500 Thermostat? ' eHow.com http://www.ehow.com/how_7267447_do-display-honeywell-rth8500-thermostat_.html#ixzz17KTxLwBU

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Hi, Check the batteries and replace as needed or check for power from the air handler/ furnace...

Here is a tip that tells you how to get a manual for most any Honeywell productonline...

Manual Honeywell How to Find Honeywell Manuals

heatman101

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Remote Sensor (Setup Function 0340): If an optional outdoor sensor is installed, the thermostat can display the outside temperature. If an optional remote indoor sensor is installed, the thermostat will display the temperature at the sensor location (the internal sensor in the thermostat is not used).
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