In most cases, the main product notes a malfunction (a
malfunction can lead to disturbance in comfort) and indic-
ates 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 items:
• 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.
• The main product’s temperature limiter.
LOW OR A LACK OF VENTILATION
• Level monitor (BL2) tripped.
– Checking the condensation water drain and water seal.
• The exhaust air filter (HQ10) and/or the supply air filter
(HQ11) is clogged.
– Replace the filters.
• The ventilation is not adjusted.
– Order/implement ventilation adjustment.
• Closed, too much choke or blocked ventilation device.
– Check and clean the ventilation devices.
• Fan speed in reduced mode.
– Enter the main product’s menu 1.2.1 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 20) if installed.
HIGH OR DISTRACTING VENTILATION
• The exhaust air filter (HQ10) and/or the supply air filter
(HQ11) is clogged.
– Replace the filters.
• 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.
– Enter the main product’s menu 1.2.1 and select "Normal".
• External switch for changing the fan speed activated.
– Check any external switches.
• Silencers not correctly installed.
– Check the silencers.
17Chapter 8 | Disturbances in comfortNIBE ERS 20-300
S
Disturbances in comfort
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