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Honeywell Trol-A-Temp T8090T Owner's Manual page 20

Zone thermostat heating/cooling thermostat and subbase or wallplate
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Voltage at Clock Terminals
AC VOLTAGE AT
C-R TERMINALS
0 Vac
Up to 15 Vac.
15 to 30 Vac.
POSSIBLE CAUSE
CHECK
1. System power is Off.
2. Short in clock power supply wiring. 2. Replace wiring.
3. Limit switch contacts stuck open.
4. Transformer supplying power is
burned out.
1. System transformer used to power
the clock is inadequate.
2. Additional (separate) transformer
used to power the clock has
inadequate voltage.
1. Spring fingers on thermostat are
not making proper contact with the
subbase terminals.
2. Clock has failed.
1. Restore power.
3. Free or replace limit switch.
4. Replace transformer.
1. Use additional (separate)
transformer.
2. Install transformer with proper
secondary voltage.
1. Rebend spring fingers to a 45
degree angle to assure proper
contact.
2. Replace the thermostat.
20
ACTION
69-0432—1

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