Troubleshooting - Honeywell VISIONPRO 68-0287-04 User Manual

®
VISIONPRO IAQ TOTAL HOME COMFORT SYSTEM

TROUBLESHOOTING

Symptom
Display does not come on
Temperature setting does not
change
Heating or cooling does not
come on and thermostat is not
calling for heat or cool.
Heating or cooling does not
come on and thermostat is
calling for heat or cool.
Heat does not turn on ("Heat On"
is solid in the display)
68-0287—04
Table 15. Troubleshooting.
Possible Cause
Thermostat is not being powered
The upper and lower temperature
limits reached
Keypad is fully locked
Thermostat minimum off timer is
activated
System selection is not set to Heat
or Cool
Heating or cooling equipment is not
operating
Heating Equipment failure
Loose or broken wire connection
between Equipment Interface
Module and heating equipment.
Communication is not being
completed
36
Action
Check if the thermostat is mounted and latched on the wall
plate. If not:
— Mount and latch the thermostat on the wallplate.
Check if the circuit breaker is tripped or the fuse is blown; if
it is:
— Reset the circuit Breaker or replace the fuse.
Check if the power switch at the equipment is in the off
position; if it is:
— Set to the on position.
Check for 24 Vac between terminals 2 and 3 at the
thermostat.
— Replace any broken wires if 24Vac is not present.
— Replace thermostat if 24Vas is present.
Check for 24 Vac between terminals R and C at the
Equipment interface module.
— If 24Vac is not present consult electrician.
— If 24 Vac is Present replace Equipment interface
module.
Check temperature setpoints.
Check installer setup Numbers 0600 and 610; modify as
needed.
Check Installer Setup Number 670 to change keypad
locked options.
Wait up to 5 minutes for the system to respond (Wait is
displayed on the Thermostat home screen.
Set system selection to correct setting.
Check Wiring.
Check installer setup number 172 and verify the correct
system type is chosen.
Verify operation of equipment in system test mode.
Check for 24 Vac at the equipment on the secondary side
of the transformer between power and common. If voltage
is not present check the heating equipment to find the
cause of the problem.
Check for 24 Vac between the heat terminal(s) on the
equipment interface Module and transformer common. If
present check heating equipment to find the cause of the
problem.
Check for 24 Vac between the heat terminal(s) on the
HVAC equipment and system transformer common. If
voltage is not present check for loose or broken wires
between the EIM and heating equipment.
End the call for heat at the thermostat then repeat the call
for heat. Check the communication LED on the EIM board.
— If the LED does not blink, check communication
wiring (wire between terminal 1 on both the EIM
and thermostat.
— If the LED does blinks correctly, check for 24 Vac
between heating terminals on the EIM and the sys-
tem common.
If 24 Vac is not present check the R to Rh connection on
the EIM, if the connection is good replace the EIM.