Honeywell AQ254 Series Manual page 20

AQ250 SERIES HYDRONIC CONTROL PANELS
Diagnostic Led Status
Steady (no blinking)
Fast blinking (4 blinks per second)
Slow blinking (2 blinks every 3 seconds)
Coded blinking = ERROR 2 blinks then
Diagnostic Led Status
Steady (no blinking)
Fast blinking (4 blinks per second)
Slow blinking (2 blinks every 3 seconds)
Coded blinking = ERROR
AQUATROL® is a registered trademark of Resideo Technologies, Inc.
Aquastat® is a registered trademark of Resideo Technologies, Inc.
Resideo Technologies, Inc.
1985 Douglas Drive North, Golden Valley, MN 55422
1-800-468-1502
www.resideo.com 68-0306—07 M.S. Rev. 05-20 | Printed in United States
© 2020 Resideo Technologies, Inc. All rights reserved.
The Honeywell Home trademark is used under license from Honeywell International, Inc. This product is manufactured by Resideo Technologies, Inc. and its affiliates.
Table 4. AQ15000B Control Module LED Display and Error Codes.
No system problem detected
Auto Test is in operation
Auto Test has been paused
Freeze protection activated across
pause AQUATROL network
4 blinks then Return sensor open / short
pause
5 blinks then Supply sensor open / short
pause
Table 5. AQ155/AQ157 Zoning Module LED Display and Error Codes.
No system problem detected
Auto Test is in operation
Auto Test has been paused
• 2 blinks then Freeze protection activated on the
pause Zoning Module
• 3 blinks then Communication lost with ALL
pause thermostats
System Condition
System Condition
Action Required
None.
None. Permit the control to finish
Auto Test routine.
Press the Test button to resume Auto
Test routine.
All zones have lost communication
with controller.
• Check B-B wiring between Control
Module and Zoning Module.
Check the return sensor wiring.
Check the supply sensor wiring.
Action Required
None.
None. Permit the control to finish
Auto Test routine.
Press the Test button to resume Auto
Test routine.
Zoning module has lost
communication with controller.
• Check B-B wiring between Control
Module and Zoning Module.
Check thermostat wiring to Zoning
Modules.