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2VV.
Creating innovative solutions for you and your business since 1995.
ver.2 09-12-19
During maintenance of the heater unit, the main power supply must be off. It is necessary to let the unit cool
down before maintenance works!
For any manipulation with the heater unit, protective gloves must be used to avoid injury from sharp edges!
If you are not sure by correctness of your steps, do not start any repairs and call the professional service!!!
Possible problems …
If you cannot find, remove the defect or if it requires intervention to the device, please call an authorised
service!
9. TROUBLESHOOTING
Device behaviour
Anticipated problem
Solution
The device is noisy
Air in the device.
De-aerate the device by increased pres-
sure and flow of the heating medium.
Stop valves on the device are not
fully open.
Open fully the stop valves.
Damaged fan bearings.
Impeller shows clearance or cannot
rotate freely.
It is necessary to dismantle the fan and
replace bearings in an authorised
service, or replace the complete fan.
Unbalanced impeller of the fan
rotates freely, but vibrates shortly
when the fan is turned on.
Dismantle the fan and give it to
a professional service for balancing.
Insufficient heat capacity
of the heater unit
Air in the unit exchanger.
De-aerate the exchanger using
air release screws
The exchanger is chocked strongly.
Dismantle the fan and clean the ex-
changer. Use preferably hot water or
steam for cleaning. Do not use aggres-
sive detergents.
Stop or regulation valves on the
device are not fully open.
Open fully the stop valves, and check
whether the regulation valve is open.
Incorrect rotation direction of the
mixing valve.
Correct el. connections on the terminal
board of the regulation.
Clogged filter.
Replace or clean the filter thoroughly.
