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I have a 6.595.430 or D509.151 HP thermostat that all of a…

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i have a 6.595.430 or...
i have a 6.595.430 or D509.151 HP thermostat that all of a sudden two weeks ago is stuck on HOLD with hour and date and will not release it to allow me to change the temperature. Can you help me?
thanks.
Bonnine
Submitted: 3 years ago.Category: HVAC
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Answered in 5 minutes by:
6/15/2015
HVAC Technician: HVAC Guru, HVAC TECH replied 3 years ago
HVAC Guru
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