To Drain The Domestic Hot Water Tank; 12 Troubleshooting; Overview: Troubleshooting - Daikin Altherma ERLQ004-006-008CA Reference Manual

12 Troubleshooting

NOTICE
Handle the water filters with care. Do NOT use excessive
force when you reinsert the water filters so as NOT to
damage the water filters mesh.
1 3
2
4
5
Water pressure relief valve
Open the valve and check if it operates correctly. The water may be
very hot!
Checkpoints are:
▪ The water flow coming from the relief valve is high enough, no
blockage of the valve or in between piping is suspected.
▪ Dirty water coming out of the relief valve:
▪ open the valve until the discharged water does NOT contain dirt
anymore
▪ flush the system and install an additional water filter (a
magnetic cyclone filter is preferable).
To make sure this water originates from the tank, check after a tank
heat up cycle.
It is recommended to do this maintenance more frequently.
Pressure relief valve hose
Check whether the pressure relief valve hose is positioned
appropriately to drain the water. See
relief valve to the drain" on page 32.
Relief valve of the domestic hot water tank (field supply)
Open the valve and check the correct operation. Water may be very
hot!
Checkpoints are:
▪ The water flow coming from the relief valve is high enough, no
blockage of the valve or in between piping is suspected.
▪ Dirty water coming out of the relief valve:
▪ open the valve until the discharged water does not contain dirt
anymore
▪ flush and clean the complete tank, including the piping between
the relief valve and cold water inlet.
To make sure this water originates from the tank, check after a tank
heat up cycle.
It is recommended to do this maintenance more frequently.
Switch box
▪ Carry out a thorough visual inspection of the switch box and look
for obvious defects such as loose connections or defective wiring.
▪ Using an ohmmeter, check if contactors K1M, K2M and K3M
operate correctly. All contacts of these contactors must be in open
position when the power is turned OFF.
WARNING
If the internal wiring is damaged, it has to be replaced by
the manufacturer, its service agent or similarly qualified
persons.
Installer reference guide
64
"7.8.5 To connect the pressure
Descaling
Depending on water quality and set temperature, scale can deposit
on the heat exchanger inside the domestic hot water tank and can
restrict heat transfer. For this reason, descaling of the heat
exchanger may be required at certain intervals.
Chemical disinfection
If the applicable legislation requires a chemical disinfection in
specific situations, involving the domestic hot water tank, please be
aware that the domestic hot water tank is a stainless steel cylinder
containing an aluminium anode. We recommend to use a non-
chloride based disinfectant approved for use with water intended for
human consumption.
NOTICE
When using means for descaling or chemical disinfection,
it must be ensured that the water quality remains compliant
with EU directive 98/83 EC.
Anode
No maintenance or replacement required.
11.4.1

To drain the domestic hot water tank

Prerequisite: Switch OFF the power supply.
Prerequisite: Turn OFF the cold water supply.
1 Open the front panel.
2 Remove the 2 screws, unhook and put the switch box aside.
3 The drain hose is located at the right side of the unit. Cut the tie
wraps or tape and bring the flexible drain hose forward.
a Drain hose
INFORMATION
To drain the tank, all the hot water tapping points need to
be opened to allow air to enter the system.
4 Open the drain valve.
12 Troubleshooting
12.1

Overview: Troubleshooting

This chapter describes what you have to do in case of problems.
It contains information about:
▪ Solving problems based on symptoms
▪ Solving problems based on error codes
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ERLQ004~008CA + EHVZ04+08S18CB
Daikin Altherma – Low temperature split
4P401676-1 – 2015.02