10
11. FAULT FINDING
Disconnect the electrical supply before removing the terminal cover. It is recommended
that any service operations on this Sector heater are carried out by a qualified engineer.
NOTE:
Use only Sector approved spare parts. Replacement of any parts with
components not recommended by Sector 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
SPACK ALK04 (see section 1.0)
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 SPACK ALK05
(see section 1.0)
2. Fit pack SPACK ALKO4
(see section 1.0)
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
SPACK ALKO4 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
