Honeywell AQ25A Series Technical Reference Booklet page 129

LCD Display Parameter
FRZ PROT
HEAT DHW
BOILER: (continued) HEATING
IDLE
INIT
INST PURG
INSTALL
PMP EXER
POST PURG Boiler is active with Post Purge operation and is sending the purged water to the Boiler
PURGE DHW Boiler is active with Post Purge operation and is sending the purged water to the DHW
CALL FOR COOL
CALL FOR DHW
CALL FOR HEAT
CWSD ACTIVE
DHW DISABLE
INJECTION%: xx%
LOST ZONE A-1
...
LOST ZONE D-16
MIN. RETURN PROT
NO DHW PROBE
NO LINE VOLTAGE
NO OUTDOOR PROBE
NO RETURN PROBE
NO SECOND. PROBE
NO SUPPLY PROBE
SHORT CYCLE PROT
VALVE INIT
WATER READY
WWSD ACTIVE
Table 4. LCD Status Notices and Error Messages. (Continued)
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)
Boiler is active to serve DHW.
Boiler is active to serve zones.
Boiler is not active.
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.
Boiler is active while the AQ252 is conducting the PURGE operation in the Installer
Setup.
Boiler is in ready mode during Installer Setup.
Boiler is disabled while the AQ252 is exercising all pumps and valves connected to the
AQUATROL network.
(Primary) loop.
tank.
n/a At least one zone with a programmable thermostat requires cooling.
n/a The DHW requires heat.
n/a At least one zone requires heat.
n/a Zone calls for cooling are not served because CWSD (Cold Weather Shutdown) is in
progress.
n/a DHW call is not served because it is disabled.
n/a The variable speed injection pump terminals are active and operating at xx% of full
speed.
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).
n/a The temperature measured by the return sensor is at or below the minimum return water
temperature.
n/a No DHW sensor connected or it is defective.
n/a No line voltage has been detected on the N and L terminals on the line voltage input to
the control module.
n/a No outdoor sensor connected or it is defective.
n/a No return sensor connected or it is defective.
n/a No secondary (mixed) loop sensor connected or it is defective.
n/a No supply sensor connected or it is defective.
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).
n/a Motorized mixing valve controlling the secondary loop is being initialized and
repositioned (opening or closing) to meet the secondary loop target temperature.
n/a Boiler Supply Water temperature is at or above the target temperature calculated by the
AQ252.
n/a Zone calls for heat is not served because WWSD (Warm Weather Shutdown) is in
progress.
AQ252 Universal Injection/Mixing Boiler Reset Control Panels
Meaning
23 69-1986—02