Troubleshooting | 25SM Split AH/AV Air Handler
8733826256 (2020/06)SM Split AH/AV Air Handler
Subject to change without prior notice
Unit Lockouts
Periodic lockouts almost always are caused by air
or water flow problems. The lockout (shutdown) of
the unit is a normal protective measure in the
design of the equipment. If continual lockouts
occur call a mechanic immediately and have them
check for: water flow problems, water
temperature problems, airflow problems or air
temperature problems. Use of the pressure and
temperature charts for the unit may be required to
properly determine the cause.
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