Honeywell T8090A/191108A Owner's Manual page 22

Voltage At Clock Terminals
AC Voltge at
C-C Terminals
0 Vac.
Up to 15 Vac.
15 to 30 Vac.
69-0574—2
Check
1. System power off.
2. Short in clock power supply
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 o thermostat not
making proper contact with
subbase terminals.
2. Clock has failed.
1. Restore power.
2. Replace wiring.
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 ensure proper contact.
2. Replace thermostat.
22
Action