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HVAC Guru
HVAC Guru, HVAC TECH
Category: HVAC
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Experience:  15yrs in the HVAC industry with certificates and degrees.
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Inam a tech, and my customer have a icomfort with Lennox

Customer Question

Inam a tech, and my customer have a icomfort with Lennox xc21048, and the screen on the tstat keep going black, until they reboot it by killing the power switch, but after it cycle through it goes back blank with could cause this
Submitted: 6 months ago.
Category: HVAC
Expert:  HVAC Guru replied 6 months ago.

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Answer:

The thermostat is bad nothing else would really cause that issue. You should verify power to the thermostat when it is blank though just in case it is losing power. Other than that replace the thermostat.

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Customer: replied 6 months ago.
I'm sorry what could cause it problem, and how would I begin to fix this issue, I'm here with my customer now
Customer: replied 6 months ago.
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Expert:  HVAC Guru replied 6 months ago.

If the unit is power off after it cycles either the internal thermostat board is defective shutting down or you could actually be losing power to the thermostat, check between the R and C terminals for 24 volts when it is blank, if you have power there and it is blank and you have to reset it replace the thermostat.

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