10
11.0 FAULT FINDING
Disconnect the electrical supply before removing the terminal cover. It is recommend-
ed that any service operations on this Santon heater are carried out by a competent
person.
NOTE:
Use only Santon approved spare parts. Replacement of any parts with
components not recommended by Santon will invalidate the guarantee and may render
the installation dangerous.
ACTION
POSSIBLE CAUSES
FAULT
1. Check electrical supply
1. Electrical supply fault
Water not heating
2. Check cut-out, if operated reset and
check thermostat operation. If necessary
replace thermostat/thermal cut-out (see
Wiring Diagram)
2. Thermal cut-out tripped
3. Check thermostat operation, replace if
necessary
3. Thermostat fault
Fit Pressure Reducing Valve Pack
ALK04 (94970011) see IMPORTANT
INSTALLATION POINTS
pressure
Excessive mains water
pressure
(continuously)
Pressure Relief Valve
Discharge of water from
possible
(intermittently)
Presure Relief Valve
Discharge of water from
1. Fit pack ALK05 (94970012)
see IMPORTANT INSTALLATION
POINTS
2. Fit pack ALK04 (94970011) see
IMPORTANT INSTALLATION POINTS
3. Replace Pressure Relief Valve.
4. Check and if necessary, re-charge
Expansion Vessel pre-charge pressure
(see Section 9.0)
1. Expansion in mains not
possible.
2. Mains pressure exceeds
4.1 bar (60 p.s.i.)
3. Pressure Relief Valve Fault
4.Loss of pressure from
Expansion Vessel
Thermostat and
thermal cut-out fault
Replace thermostat and thermal cut-out
Pressure Relief Valve
water/steam from
Relief Valve and or
Temperature/Pressure
Discharge of water from
1. Check all valves are correctly installed
in accordance with flow direction arrows
1. Inlet valves incorrectly
fitted
No water flow
2. Check mains water supply is on
2. Mains water supply not
turned on
3. Check for obstructions. If pack ALK04
(94970011) is fitted check strainer is not
blocked.
3. Blockage in mains water
supply
Water from a pressurised system releases
oxygen bubbles when flowing. The
milkiness will disappear after a short
time.
Oxygenated water
"Milky" water