Honeywell VisionPRO IAQ Product Data page 36

Total home comfort system

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Operating manual (96 pages)

Installation manual (25 pages)

Installation manual (25 pages)

Table of Contents

VISIONPRO

IAQ TOTAL HOME COMFORT SYSTEM

Symptom

Cooling does not turn on ("Cool

On" is solid in the display)

2nd stage heat or cool does not

energize

"Err" appears in time field of

home screen on thermostat

Fan does not turn on in a call for

heat (electric furnace).

Heat pump puts out cool air in

the heat mode and warm air in

the cool mode.

Both the heating and cooling

equipment are running at the

same time.

Heating equipment is running in

the cool mode.

Heating equipment does not turn

off and heat temperature setting

is set below room temperature

(Heat On is not in the display).

Cannot set the system setting to

Heat.

Cannot set the system setting to

Cool.

68-0287—1

Table 15. Troubleshooting. (Continued)

Possible Cause

Cooling Equipment failure

Loose or broken wire connection

between Equipment Interface

Module and cooling equipment.

Communication is not being

completed

Stage configuration is not set

correctly to match the number of

selected stage

Terminals not connected properly at

EIM

Thermostat has detected an error

on the communication bus

Fan Control in Heating is set to Gas

or Oil Furnace (Setting 0180).

Changeover Valve (Installer Setup

Number 0190) is not configured to

match the changeover required by

the installed heat pump.

The heating equipment is not a heat

pump but the System Type (Installer

Setup Number 0172) is set to Heat

Pump.

Heating and cooling wires are

shorted together.

Heating equipment is not a heat

pump but System Type (Installer

Setup Number 0172) is set to Heat

Pump.

Heating equipment is not a heat

pump but System Type (Installer

Setup Number 0172) is set to Heat

Pump.

System Type (Installer Setup

Number 0172) is set to Cool Only.

System Type (Installer Setup

Number 0172) is set to Heat Only or

Heat Only with Fan.

Action

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 cooling equipment to find the

cause of the problem.

Check for 24 Vac between the cool terminal(s) on the

equipment interface Module and transformer common. If

present check cooling equipment to find the cause of the

problem.

Check for 24 Vac between the cool terminal(s) on the

cooling equipment and system transformer common. If

voltage is not present check for loose or broken wires

between the EIM and cooling equipment.

End the call for cool at the thermostat then repeat the call

for cool. 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.

Set the stage configuration in installer setup for additional

stages of cool (ISU 174) or additional stages of heat (ISU

176).

Check that 24 Vac is present at W2/AUX and W3/AUX2 for

2nd and 3rd stages of conventional heating and for 3rd and

4th stages of heat pump heating. Also check that 24VAC is

present at Y2 for 2nd stage of cooling or 2nd stage heat in

heat pump applications.

Refer to error code section for more information.

Set Fan Control in Heating to Electric Furnace (Setting

0180).

Set Changeover Valve (Installer Setup Number 0190) to

match the changeover required by the installed heat pump.

Set System Type (Installer Setup Number 0172) to match