Honeywell AQ25A Series Technical Reference Booklet page 66

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
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 Honeywell International Inc.
Aquastat® is a registered trademark of Honeywell International Inc.
Automation and Control Solutions
Honeywell International Inc.
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Golden Valley, MN 55422
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® U.S. Registered Trademark
© 2009 Honeywell International Inc.
68-0306—02 M.S. Rev. 10-09
Table 4. AQ15000B Control Module LED Display and Error Codes.
No system problem detected
Auto Test is in operation
Auto Test has been paused
2 blinks then pause Freeze protection activated across
AQUATROL network
4 blinks then pause Return sensor open / short
5 blinks then pause Supply sensor open / short
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
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Toronto, Ontario M1V 4Z9
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.