AQ250 SERIES HYDRONIC CONTROL PANELS
Automation and Control Solutions
Honeywell International Inc.
1985 Douglas Drive North
Golden Valley, MN 55422
customer.honeywell.com
® U.S. Registered Trademark
© 2013 Honeywell International Inc.
68-0306—05 L.L. Rev. 10-13
Printed in United States
AQUATROL® is a registered trademark of Honeywell International Inc.
Aquastat® is a registered trademark of Honeywell International Inc.
Table 4. AQ15000B Control Module LED Display and Error Codes.
Diagnostic Led Status System Condition Action Required
Steady (no blinking) No system problem detected None.
Fast blinking (4 blinks per second) Auto Test is in operation None. Permit the control to finish Auto
Test routine.
Slow blinking (2 blinks every 3 seconds) Auto Test has been paused Press the Test button to resume Auto
Test routine.
Coded blinking = ERROR 2 blinks then pause Freeze protection activated across
AQUATROL network
All zones have lost communication with
controller.
• Check B-B wiring between Control
Module and Zoning Module.
4 blinks then pause Return sensor open / short Check the return sensor wiring.
5 blinks then pause Supply sensor open / short Check the supply sensor wiring.
Table 5. AQ155/AQ157 Zoning Module LED Display and Error Codes.
Diagnostic Led Status System Condition Action Required
Steady (no blinking) No system problem detected None.
Fast blinking (4 blinks per second) Auto Test is in operation None. Permit the control to finish Auto
Test routine.
Slow blinking (2 blinks every 3 seconds) Auto Test has been paused Press the Test button to resume Auto
Test routine.
Coded blinking = ERROR • 2 blinks then
pause
Freeze protection activated on the
Zoning Module
Zoning module has lost communication
with controller.
• Check B-B wiring between Control
Module and Zoning Module.
• 3 blinks then
pause
Communication lost with ALL
thermostats
Check thermostat wiring to Zoning
Modules.
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