AQ252 Universal Injection/Mixing Boiler Reset Control Panels
23 69-1986—02
FRZ PROT Boiler freeze protection activated:
• Communication between Control Module and Zoning Module has been lost for more
than 1 minute
or
• Boiler supply temperature is less than 50°F (10°C)
HEAT DHW Boiler is active to serve DHW.
BOILER: (continued) HEATING Boiler is active to serve zones.
IDLE Boiler is not active.
INIT Boiler contacts (terminals 22 and 23) on the AQ152, which are connected to the boiler's
T-T terminals, have been shorted and the boiler is beginning its firing sequence.
INST PURG Boiler is active while the AQ252 is conducting the PURGE operation in the Installer
Setup.
INSTALL Boiler is in ready mode during Installer Setup.
PMP EXER Boiler is disabled while the AQ252 is exercising all pumps and valves connected to the
AQUATROL network.
POST PURG Boiler is active with Post Purge operation and is sending the purged water to the Boiler
(Primary) loop.
PURGE DHW Boiler is active with Post Purge operation and is sending the purged water to the DHW
tank.
CALL FOR COOL n/a At least one zone with a programmable thermostat requires cooling.
CALL FOR DHW n/a The DHW requires heat.
CALL FOR HEAT n/a At least one zone requires heat.
CWSD ACTIVE n/a Zone calls for cooling are not served because CWSD (Cold Weather Shutdown) is in
progress.
DHW DISABLE n/a DHW call is not served because it is disabled.
INJECTION%: xx% n/a The variable speed injection pump terminals are active and operating at xx% of full
speed.
LOST ZONE A-1
…
LOST ZONE D-16
n/a Lost communication with a zone (A-1 to A-16, B-1 to B-16, C-1 to C-16, or D-1 to D-16).
MIN. RETURN PROT n/a The temperature measured by the return sensor is at or below the minimum return water
temperature.
NO DHW PROBE n/a No DHW sensor connected or it is defective.
NO LINE VOLTAGE n/a No line voltage has been detected on the N and L terminals on the line voltage input to
the control module.
NO OUTDOOR PROBE n/a No outdoor sensor connected or it is defective.
NO RETURN PROBE n/a No return sensor connected or it is defective.
NO SECOND. PROBE n/a No secondary (mixed) loop sensor connected or it is defective.
NO SUPPLY PROBE n/a No supply sensor connected or it is defective.
SHORT CYCLE PROT n/a There is a call for heat, but less than two minutes have elapsed since the last firing of the
boiler (prevents short cycling).
VALVE INIT n/a Motorized mixing valve controlling the secondary loop is being initialized and
repositioned (opening or closing) to meet the secondary loop target temperature.
WATER READY n/a Boiler Supply Water temperature is at or above the target temperature calculated by the
AQ252.
WWSD ACTIVE n/a Zone calls for heat is not served because WWSD (Warm Weather Shutdown) is in
progress.
Table 4. LCD Status Notices and Error Messages. (Continued)
LCD Display Parameter Meaning
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