What to do if a flashing symbol appears on my Alfa Laval Water Heater display after it's been running?
If a flashing symbol appears on the display of your Alfa Laval Water Heater after it has been operating for a while, it indicates that the heating appliance is showing an error. Press the button to see the error code. This fault code depends on the type of heating appliance.
Why is the display blank on my Alfa Laval Micro STC2?
If the display of your Alfa Laval Water Heater is blank, it could be due to a lack of power to the heating appliance after installing the CM737, or the rechargeable battery hasn’t been charged yet. It takes a maximum of 1 hour until fully charged. Check if the power supply cable of the heating appliance is connected. It can also happen if the power supply or the communication link between the CM737 and the heating appliance has been interrupted for more than 8 hours. In this case, check the power supply cable. After the power is restored the time may need to be adjusted.
What to do if a symbol appears permanently on the Alfa Laval Water Heater display?
If a symbol appears permanently (no flashing) on the display of your Alfa Laval Water Heater, there may be a communication error due to an interrupt or short circuit in the link between the heating appliance and the CM737. Check if the power supply cable of the heating appliance is connected and also check the wiring.
Why does a flashing symbol appear quickly on my Alfa Laval Micro STC2 display?
If a flashing symbol appears on the display of your Alfa Laval Water Heater within one minute of the CM737 being powered on, it could be because the CM737 receives power supply from the heating appliance, but no information. The CM737 might not be connected to the correct terminals of the heating appliance. Check if the wiring is connected to the Open Therm connection terminals of the heating appliance. Also, the heating appliance may not be configured correctly.
What to do if a flashing symbol appears on the Alfa Laval Boiler display after operating for a while?
If a flashing symbol appears on the display of your Alfa Laval Boiler after it has been operating for some time, it indicates that the heating appliance is showing an error. Press the button to see the error code. This fault code depends on the type of heating appliance.
Why is the display blank on my Alfa Laval Boiler?
If the display of your Alfa Laval Boiler is blank, it could be due to a couple of reasons. First, after installing the CM737, no power might be supplied to the heating appliance, and the rechargeable battery hasn’t been charged yet (it takes up to 1 hour to fully charge). Second, the power supply or communication link between the CM737 and the heating appliance might have been interrupted for more than 8 hours. In both cases, check if the power supply cable of the heating appliance is connected.
What does it mean when a symbol appears permanently on my Alfa Laval Boiler display?
If a symbol appears permanently (without flashing) on the display of your Alfa Laval Boiler, it indicates a communication error due to an interrupt or short circuit in the link between the heating appliance and the CM737. Check if the power supply cable of the heating appliance is properly connected and also check the wiring.
How to troubleshoot a flashing symbol on the Alfa Laval Boiler display shortly after powering on?
If a flashing symbol appears on the display of your Alfa Laval Boiler within one minute of powering it on, it means the CM737 receives power supply from the heating appliance, but no information. The CM737 might not be connected to the correct terminals of the heating appliance. Check if the wiring is connected to the Open Therm connection terminals of the heating appliance.
General| Brand | Alfa Laval |
|---|---|
| Model | Micro STC2 |
| Category | Water Heater |
| Language | English |
Overview of CM721 system, thermostat features, and RF installation considerations.
Explanation of AUTO/MAN/OFF modes and programming heating schedules for optimal comfort.
Steps to review and modify heating time/temperature settings for CM737 and CM721.
Basic CM721 operation, communication loss handling, and fail-safe mode setup.
Steps to access and navigate installer configuration settings.
List of error codes, their causes, and recommended actions for the CM737.
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