Honeywell T8090A/191108A - Page 22

69-0574—2 22
Voltage At Clock Terminals
AC Voltge at
C-C Terminals
Check Action
0 Vac. 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. Restore power.
2. Replace wiring.
3. Free or replace limit switch.
4. Replace transformer.
Up to 15 Vac. 1. System transformer used to power
the clock is inadequate.
2. Additional (separate) transformer
used to power the clock has
inadequate voltage.
1. Use additional (separate) transformer.
2. Install transformer with proper secondary
voltage.
15 to 30 Vac. 1. Spring fingers o thermostat not
making proper contact with
subbase terminals.
2. Clock has failed.
1. Rebend spring fingers to a 45 degree
angle to ensure proper contact.
2. Replace thermostat.