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1F95-391FAQs
is dependent on system sizing, thermostat location, etc. Note: The thermostat display only
displays whole numbers. Internally the thermostat calculates decimals.
In heating as the room temperature increases the system will continue to run until the
thermostat reaches the high side of the temperature setpoint.
There are 3 possibilities to consider, excluding tampering.
1. Loss of power from the system, 24VAC should be constant to maintain a display.
2. Static electricity or a voltage spike from the heating equipment might be resetting the
thermostat. Static electricity can be eliminated by touching something before touching the
thermostat to dissipate the static charge. A voltage spike from the equipment can be
eliminated using an isolation relay as described in the link below.
http:www.white-rodgers.com/pdfs/instruction_sheets/0037_5426_A.pdf
You can also check the wire routing to verify the thermostat or remote wires are not running
parallel to high voltage lines with high inductive loads which could (in extreme cases)
create a voltage spike at the thermostat.
3. Thermostat not functioning properly. A simple test would be to bench test one of the units
for a couple of days to see if it resets or move it to another system where a reset has never
occurred.
(cont.)
13.Why does the system run
with the setpoint and room
temperature the same?
14. How do I reset my
thermostat?