CTC Union EcoZenith i350 L 1x230V, Installation And Maintenance Manual

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121 CTC EcoZenith i360
13.2 Troubleshooting, hot water
Cause Action
Incorrect pressure in system
Check pre-pressure in the expansion tank with a pressure gauge.
0.5–0.6 bar. Fill the heating system; pressure should increase to approx.
1–1.5 bar.
Bleed the tank, turn the safety valve.
Bleed the tank, check that the automatic bleeder on the tank works.
Air pockets in various parts of the
system
Carry out a function test on the diverting valve, touchscreen: “Installer/
Service/Function test”. Valves – 3-valve change between DHW and HS.
Carry out a function test on the hot tap water pump, touchscreen:
“Installer/Service/Function test”. Hot water – tap hot water pump.
Increase and decrease speed.
Increase the system pressure to 2.5 bar by filling the radiator system;
then test the safety valve; water and air pockets are released.
Cold water from the building
mixer is leaking back. Causes
dilution of hot water
Test the kitchen mixer on full heat, switch off, and then open the tap
in the shower/bathroom straight away. If the hot water pipe under the
kitchen mixer cools down quickly, it is leaking cold water backwards.
Replace the mixer.
Hot water is collecting up
too quickly. The DHW heat
exchanger is not managing to
transfer heat.
Let the water into the bathtub a little more slowly and use a low-flow
shower head.
Hot water requirements set
incorrectly
Increase level, touchscreen: “DHW/Economy”, “Normal” or “Comfort”.
Heat source out of order
Make sure the heat pump or other heat source is operational and that
no error messages are shown. Contact the installation engineer in the
first instance.