Nibe ERS 20-250, Installer Manual

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In most cases, the main product notes a malfunction (a
malfunction can lead to disturbance in comfort) and in-
dicates this with alarms and shows action instructions
in the display.
Troubleshooting
If the operational interference is not shown in the display
the following tips can be used:
BASIC ACTIONS
Start by checking the following possible fault sources:
• That the main product is running and that the supply
cable to ERS 20 is connected.
• Group and main fuses of the accommodation.
• The property's earth circuit breaker.
• The main product's fuses/temperature limiter.
HIGH OR LOW ROOM TEMPERATURE
• See Installer Manual for the main product.
LOW OR A LACK OF VENTILATION
• Level monitor (BL2) tripped.
– Checking the condensation water drain and water
seal.
• Filter blocked.
– Clean or replace the filter.
• The ventilation is not adjusted.
– Order/implement ventilation adjustment.
• Closed, too much choke or blocked ventilation device.
– Check and clean the exhaust air devices.
• Fan speed in reduced mode.
– Go to the main product’s menu 1.2.1 for the S-series
and 1.2 for the F-Series and select "normal".
• External switch for changing the fan speed activated.
– Check any external switches.
• Fan running slow because of low incoming outdoor
air temperature.
– Check the function and settings for the electrical air
heater (EAH) if installed.
HIGH OR DISTRACTING VENTILATION
• Filter blocked.
– Clean or replace the filter.
• The ventilation is not adjusted.
– Order/implement ventilation adjustment.
• Closed, too much choke or blocked ventilation device.
– Check and clean the exhaust air devices.
• Fan speed in forced mode.
– Go to the main product’s menu 1.2.1 for the S-series
and 1.2 for the F-Series and select "normal".
• External switch for changing the fan speed activated.
– Check any external switches.
• Silencers not correctly installed.
– Check the silencers.
NIBE ERS 20-250 Chapter 8 | Disturbances in comfort 18
8 Disturbances in comfort