Appendix
16
Installation and maintenance instructions uniSTOR HP 0020221300_04
Appendix
A
Detecting and eliminating faults
Fault
Possible cause
Remedy
No flow rate at the valve
1.
Water supply valve closed
2.
Main filter blocked
3.
Pressure reducer not installed correctly
1.
Check and open the valve.
2.
Close the water supply valve, clean the filter
and the water pressure reducer.
3.
Check whether the pressure reducer has been
installed correctly.
Low throughput and
pressure at a valve
1.
Filter in cold water supply clogged
1.
Close the cold water supply, clean the filter for
the water pressure reducer.
Water from the valve is
cold
1.
The cylinder was not set or is not operating.
2.
The heat generator does not work.
3.
The thermal cut-out was triggered.
4.
Motorised valve does not work
5.
The immersion heater does not work.
1.
Check the thermostat or the room thermostat
and, if required, set this.
2.
Check the heat generator; a fault code is
present.
3.
Check and initialise the cylinder.
4.
Check the valve's connections.
5.
Set the thermostat or the room thermostat.
Domestic hot water
temperature too high
1.
Use a thermometer to check the temperature; it
must be between 60 and 65 °C.
2.
Check the cabling.
3.
Thermostat set too high
4.
Defective thermostat
1.
Install a mixer tap.
2.
Repair the cable.
3.
Reduce the temperature of the thermostat to
55 °C.
4.
Replace the thermostat.
Irregular domestic hot
water output at the valve
1.
Defective expansion vessel
2.
Thermal control
1.
Set the expansion vessel.
2.
Interrupt the power supply of the product and
heat generator, check the thermal cut-outs and
replace these if you find any defects.
Continuous water leak
(dripping)
1.
Expansion relief valve fault
2.
Temperature and pressure relief valve fault.
1.
Determine the part that is causing the continu-
ous water leak.
2.
Replace the defective parts.
Continuous water leak
(flowing out quickly)
1.
Malfunction in the pressure reducer.
1.
Check the pressure at the pressure reducer
outlet.
2.
Replace the pressure reducer if the pressure is
above 3.5 bar.
Continuous water leak
(flowing out quickly with
hot water vapour)
1.
Temperature and pressure relief valve opened
due to an excessively high temperature.
1.
Switch off the power supply to the immersion
heater.
2.
If the immersion heater is not switched on,
switch off the power supply to the cylinder.
3.
Contact a competent person.
B
Inspection and maintenance work
–
Overview
N°
Work
Maintenance-re-
lated interval
1
Check the connections for tightness.
Annually
2
Check the temperature and pressure expansion relief valve.
Annually
3
Check the expansion relief valve.
Annually
4
Check the pressure in the expansion vessel.
Annually
5
Check the domestic hot water output at the valve (if required, clean the filters).
Annually
6
Check the target domestic hot water temperature.
Annually
7
Fill out the cylinder's benchmark checklist.
Annually
