OSO Super S Troubleshooting Guide

FAULT POSSIBLE CAUSE SOLUTION

No water flow from taps 1. Mains supply off

2. Strainer blocked

1. Check and open
stopcock

2. Turn off water supply.
Remove strainer and
clean (see servicing
procedure page 10
installation manual)

Water from hot taps is
cold

1.Immersion heaters not
switched on

2. Immersion heater
thermal cut-out has
operated

3. Programmer set to
central heating or not
switched on

4. Boiler not working

5. Cylinder thermal cut-out
has operated (indirect
units only)

6. Motorised valve not
operating correctly

1. Check and switch on.

2. Check and reset button
(see thermostat diagram
page 8 and safety cut-out
on page 5 of installation
manual).

3. Check and set to hot
water.

4. Check boiler operation.
If fault consult installer or
boiler manufacturer.

5. As at No. 2.

6. Check wiring and/or
plumbing connections to
motorised valve (see
pages 6-9 of installation
manual).

Intermittent water
discharge

1. Reduced expansion
vessel charge

1. Follow instruction
manual page 10.
“Intermittent or slow water
discharge”.

Continuous water
discharge

1. Thermal control failure
(Note: water will be hot).

2. Cold water inlet
Pressure Reducing Valve
not working.

3. Temperature and
pressure relief valve
faulty.

4. Expansion relief valve
not working properly.

1. Switch off power to
immersion heater(s) and
boiler supply to the unit.
When discharge has
stopped, check thermal
controls, replace if faulty.
Contact a competence
person.

2. Check pressure from
valve, if greater than 3 bar
replace (see page 10 of
installation manual).

3. Drain 10 litres from
cylinder and replace valve

4. Check and replace if
faulty (see page 6 of
installation manual).

Important – note: Disconnect electrical supply before removing any equipment covers

OSO SUPER S FAULT FINDING GUIDE

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