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5-2 HYDRAULIC CIRCUIT ALARMS
Managed by A2 board.
Note: This kind of alarm can not be displayed by the maintenance remote control.
5.2.1 LIST OF ALARMS
Type Designation LED Action Reset(**)
Activation of
protective
device
A2 board
-No water flow
W
Slow flashes
(once a second)
Stop
Automatic
then Manual
-Low water temperature on H/E outlet
detected by TW2 (S9)
W
Quick flashes
(twice a second)
Stop
Automatic
then Manual
Sensor failure
Sensor circuit
open or short
circuit /
Sensor failure
-Abnormal sensor for water outlet temp. (TW2 / S9)
W
flickering
Stop
Automatic
then Manual
The alarms are signalled by means of LED “W” on A2 board.
5.2.2 ALARMS RESET
Water flow default:
When the circulating pump is in operation, a lack of water flow longer than 10 seconds will cause the heat pump to
stop. The alarm light "AL" flashes.
If the lack of water flow continues for more than one minute (or if it happens more than 3 in the last hour), the water
flow fault is stored in A2 memory:
- The alarm light "AL" then remains on steady; the "W" water flow light flashes (once a second).
- The flow alarm has to be sent to the system, for that, the micro-switch sW1-2 must be set to "on".
- On A2 boards version 00 the circulating pump stops. On A2 boards versions 01 & 02, the water circulating
pump remains operating.
The alarm is reset by pressing the "reset" button, or turning the system "OFF", or by disconnecting the power
Low water temperature on H/E outlet:
Note: this function is available only on A2 board in version 02.
This alarm is detected by the TW2 sensor at the heat pump exchanger water outlet.
It is generated and stops the heat pump if the heat pump exchanger outgoing water temperature goes below a
threshold in the following cases:
- In heat mode, during defrost exclusively, if the temperature is below 16°C.
- In cool mode if the temperature is below 4°C.
This alarm is reset automatically (with a re-set differential on the threshold of + 4 K) for the first 3 events occurred the
previous hour. The "W" light of the CWC2 board flashes according to a specific rate (twice a second) to signal this
alarm. The "AL" light of the CWC2 board also flashes to signal this heat pump alarm in "automatic" phase.
If a 4th event occurs within the hour, the alarm is saved and goes to manual reset. The "AL" light of the CWC2 board
remains steady to signal this heat pump alarm in "manual" phase. The alarm saved is transmitted to the system. To
help in troubleshooting of this alarm, the "W" light continues to flash according to the specific rate until the alarm is
reset.
On alarm reset, the "W" light resumes the state of the water flow input.
TW2 sensor fault:
When a sensor fault is detected, the heat pump stops and the "AL" light of the CWC2 board flashes during the
automatic reset phase. The "W" light of the CWC2 board flashes very quickly (flickers) to signal this alarm.
If the sensor fault persists, the alarm is saved after 30 minutes and goes into manual reset. The "AL" light of the CWC2
board remains steady to signal this heat pump alarm in "manual" phase. The alarm saved is transmitted to the system.
To help in troubleshooting of this alarm, the "W" light continues to flicker until the alarm is reset.
On alarm reset, the "W" light resumes the state of the water flow input.
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