Ariston VLS Flat 50 Technical Manual page 17

- drainage hole obstructed
upriver the safety valve a proper softener to reduce water hardness or a filter to avoid
dirt and dust coming from the network;
- damaged drainage pipe
- high water network pressure
pressure reducer up river the safety valve or a tailored expansion vessel between the
safety valve and the appliance inlet pipe;
- high water temperature set-point
reduce it up to end user comfort is anyway satisfying or install a tailored expansion
Water leakage
vessel between the safety valve and the appliance inlet pipe.
From the by-pass pipe between the two tanks due to:
- wrong pipe tightening
restore the connection;
- faulty component
From the heating element fastons due to:
- corrosion
From the tank due to:
- corrosion
Power missing to the appliance due to:
- no power from mains (could be check by the end user, too)
network is not well-working, contact the power mains technical service;
- power missing to the PCB (could be check by the end user, too)
switched off, switch on it pressing the ON/OFF button;
- bad placed or damaged wirings
connect/replace it.
Incorrect appliance working mode settings:
- low water temperature set-point (could be check by the end user, too)
point is not able to satisfy the end user comfort request, adjust the set-point;
Insufficient
- occasional huge hot water amount (could be check by the end user, too)
water
user tapping profile is not predictable, deactivate the ECO function;
temperature
- incorrect time band in PREMIUM versions (could be check by the end user, too)
the programming mode is set and the time band is not in compliance with the end
user comfort request, adjust the time band.
Incorrect thermostatic mixing valve setting (if present) due to:
- low water temperature set-point
compliance with the end user comfort request, adjust the set-point;
- faulty component
replace it.
Inlet plastic pipe broken due to:
- faulty component
Low water network pressure (could be check by the end user, too)
network pressure is less than 2 bar, check if the home mains tap is fully open, if any
leakage is present upriver the water heater or contact the network technical service.
Inlet plastic pipe malfunctioning due to:
- component break
Pipes (inlet pipe or outlet pipe or by-pass between the two tanks) or safety valve
Insufficient
clogged due to:
water flow
- limestone
softener upriver the safety valve to reduce water hardness;
- dirt and dust
upriver the safety valve.
Filter obstructed (if present, anywhere in the circuit) due to:
- limestone
if the hole is obstructed, clean it and, if necessary, install
if the pipe is broken, replace it;
if the water network pressure is high, install a
if the pipe is bad connected and water comes out from it,
if the by-pass pipe is damaged, replace it.
if the heating element is damaged and water can enter, replace it.
if the tank is damaged and water spills out, replace the product.
if the thermostatic mixing valve is damaged or out of tune,
if the component is damaged, replace it.
if the component is damaged, replace it;
if limestone is present, clean it and, if necessary, install a proper
if dirt or dust is present, clean it and, if necessary, install a filter
if limestone is present, clean the filter and, if necessary, install a proper
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if the hot water temperature set-point is high,
if the power cable is disconnected/damaged,
if the thermostatic mixing valve set-point is not in
if the home power
if the appliance is
if the set-
if the end
if
if the cold water