Honeywell T8090A/191108AJ Manuel page 23

Voltage At Clock Terminals
AC voltage at
C-C terminals
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
Up to 15 Vac. 1. System transformer used to power the
2. Additional (separate) transformer used
15 to 30 Vac. 1. Spring fingers on thermostat not
2. Clock has failed.
Possible cause
check
out.
clock is inadequate.
to power the clock has inadequate
voltage.
making proper contact with subbase
terminals.
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 assure
proper contact.
2. Replace thermostat.
23
Action
69-0628B—1