Robertshaw 9720 User Manual page 37

Symptom
Thermostat does not follow program.
System runs too long.
System will not enter AUTO
(Auto Changeover) mode.
Remedy
Check AM/PM indicators at time of day and programmed time changes.
(See "PROGRAMMING. " )
Thermostat may be OFF . Select HEAT or COOL mode by pressing
SYSTEM button.
Program may not have been done in HEAT or COOL modes.
(See "PROGRAMMING".)
Both HEAT and COOL programs utilize the same setpoint time and
programmable fan settings. Only setpoint temperatures can be different.
(See "PROGRAMMING".)
Check compatibility guide and system specifications.
Thermostat in MANUAL mode. (See "OPERATION. " )
Thermostat may not have been programmed in HEAT or COOL position.
Verify program. (See "PROGRAMMING – To Review or Change Program. " )
Temperature differential may be set too high. Decrease temperature
differential to lower setting, see "PROGRAMMING".
Thermostat must be in PROGRAM mode to run AUTO system operation.
Press PROG/MAN button until PROGRAM is indicated in display. Then,
press SYSTEM button until AUTO is indicated in display.
37