What to do if a flashing symbol appears on my Alfa Laval Micro STC 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 STC?
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 Micro STC 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 STC Water Heater 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.
General| Brand | Alfa Laval |
|---|---|
| Model | Micro STC |
| Category | Water Heater |
| Language | English |
Automatic temperature control for heating and hot water systems.
Simple installation due to compact dimensions, light weight, and pre-wiring.
Heat transfer via stainless steel plates; automatic hot water control.
Heating control based on room/outdoor temperature; pump operation.
Procedures for daily, weekly, and monthly system checks.
Overview and labeled components of the AquaMicro model.
Overview and labeled components of the Micro DPC model.
Overview and labeled components of the Micro RTC model.
Overview and labeled components of the Micro STC model.
Checking for transit damage and consignment agreement.
Choosing installation area, checking regulations, flushing systems.
Procedure for mounting the substation on the wall.
CM737 controls supply temp; auto-selects sensors.
Description and features of the CM737 thermostat.
Procedure for installing the thermostat, height, and location.
CM721/BDR91 pre-configured; communication via RF band.
Description and features of the CM721 wireless thermostat.
RF technology considerations; range, walls, ceilings affecting signal.
Step-by-step guide for inserting batteries into the thermostat.
Procedure to set the current day, month, and year on the thermostat.
Procedure to set the current time on the thermostat display.
Optimal placement for thermostat during RF test, signal strength check.
Selecting between AUTO, MAN, and OFF modes.
Temperature enquiry and manual override during normal operation.
How to program heating schedules for comfort and savings.
Controls indoor temp based on outdoor air temp; heating curve adjustment.
How room temp set point changes affect supply temperature.
Setting a constant temperature for a specified number of days.
Using manual mode for a constant temperature setting.
How the relay box receives heat demand and controls the heating device.
Indicator for RF communication loss and default settings.
Reminder for routine system checks displayed on CM721.
Configuring relay box status during communication loss.
Energy efficiency feature adjusting heating start time.
Step-by-step guide to entering the installer set-up mode.
Details of parameters for CM737 Room Thermostat settings.
Details of parameters for CM737 system settings.
Details of parameters for CM737 boiler settings.
Details of parameters for CM721 Room Thermostat settings.
Details of parameters for CM721 system settings.
Settings for specific applications like Gas Boiler, Oil Boiler, etc.
Table of error sources and corresponding error codes for CM737.
Accessing diagnostic mode on CM721 for service information.
Procedure for setting the DPC valve to 25kPa.
Graph showing flow rate vs. setting for the DPC.
Overview of settings and functions for the Grundfos Alpha2L pump.
Graph illustrating pump performance curves for different speeds.
Electrical circuit diagram for the Micro RTC model.
Electrical circuit diagrams for Micro STC and STC2 models.
Schematic diagram of main components for AquaMicro.
Schematic diagram of main components for Micro DPC.
Schematic diagram of main components for Micro RTC.
Schematic diagram of main components for Micro STC.
General advice for servicing, safety precautions.
Specific service instructions for STC models.
Specific service instructions for RTC models.
Specific service instructions for HTC models.
Procedure for adjusting the hot water control valve handle.
Procedure to check and clean the heating media filter.
Procedure to check the hot water valve's function.
Procedure to replace the hot water actuator and exchanger.
Procedure to replace the hot water valve.
Procedure to replace the heating actuator.
Procedure to replace the heating valve.
Table of general operating data for the unit.
Performance data for AquaMicro at various conditions.
Performance data for various Micro models.
Instructions for installing an under floor heating thermostat.
Information on the first-fix-jig for efficient installation.
To Next Page
