Instructions for installation and use
Akva Lux II TDP RENO
18 | © Danfoss | Produced by Danfoss Redan A/S | 2016.03
VI.JV.R1.02
12. TROUBLESHOOTING - DOMESTIC HOT WATER
Problem
Possible cause
Solution
Variations in temperature
Non-return valve on the circulation line
defective (leads to mixing - and the
circulation water pipes become cold du-
Replace non-return valve.
Low temperature / variations in tem-
perature at the draining points
Non-return valve in thermostatic mixer
tap in the bathroom defective - leads to
mixing of cold and hot water-. Note that
variations in temperature may occur at
other draining points/water taps in the
system!
REMEMBER, to check all the mixer taps in
the house!
Replace mixer tap, or non-return valve
only.
Not enough pressure on the hot water
Dirt strainer in cold water meter or in the
cold water supply line clogged.
Clean dirt strainer (cold water meter
possibly in consulation with the water
supply company).
Long waiting time
Circulation pump out of operation - (not
part of the dly).
Check whether the pump is running -
whether the pump is receiving power.
control that there is no air in the pump
housing - see pump manual.
No domestic hot water
Dirt strainer on DH supply clogged.
Clean dirt strainer.
DHW temperature too low
See above.
Non-return valve on the circulation line
defective (leads to mixing - and the
circulation water pipes become cold dur-
ing tapping).
See above.
Replace non-return valve.
DHW temperature too high
Defective DHW controller.
Check the functions of the controller,
and replace if required.
Declining temperature during tapping
Air in capillary tubes.
Calified heat exchanger.
Short-circuiting of / defective heat
exchanger.
Air and rinse capillary tubes.
Clean heat exchanger with acid solution
or replace heat exchanger.
Replace heat exchanger.
Poor cooling
Calified heat exchanger.
Clean heat exchanger with acid solution
or replace heat exchanger.
Discoloured water (during a protracted
period)
Plate heat exchanger short-circuited.
Replace the plate heat exchanger.
Lack of hot water pressure
Calified plate heat exchanger.
Replace the plate heat exchanger or
clean it with acid.
