13
7.0 FAULT FINDING
WARNING: Disconnect from all electrical supplies before beginning any work
on the water heater. Water contained in the water heater may be very hot!
The water heater should give trouble free operation, however should a
problem occur, the tables below should enable most faults to be identified
with ease.
Fault Finding should be carried out by a competent person and any
replacement parts used should be authorised Heatrae Sadia spare parts.
ACTION
POSSIBLE CAUSES
FAULT
1. Check electrical supply
1. Electrical supply fault
Water not heating
WiringDiagram, page 8)
replace thermostat/thermal cut-out (see
check thermostat operation. If necessary
2. Check cut-out, if operated reset and
2. Thermal cut-out tripped
necessary
3. Check thermostat operation, replace if
3. Thermostat fault
POINTS, page 4)
U2 (see IMPORTANT INSTALLATION
Fit Pressure Reducing Valve Pack U1 and
pressure
Excessive mains water
(continuously)
Pressure Relief Valve
Discharge of water from
INSTALLATION POINTS, page 4)
1. Fit Pack U2 (see IMPORTANT
possible
1. Expansion in mains not
(intermittently)
Presure Relief Valve
Discharge of water from
2. Fit Packs U1 and U2
4.1 bar (60 p.s.i.)
2. Mains pressure exceeds
3. Fit Pack U2 when using Pack U1
Pack U2
3. Pack U1 fitted without
4. Replace Pressure Relief Valve
4. Pressure Relief Valve Fault
(see Section 6.5)
Expansion Vessel pre-charge pressure
5. Check and, if necessary, re-charge
Expansion Vessel
5. Loss of pressure from
Replace thermostat and thermal cut-out
cut-out fault
Thermostat and thermal
Pressure Relief Valve
water/steam from
Relief Valve and or
Temperature/Pressure
Discharge of water from
in accordance with flow direction arrows
1. Check all valves are correctly installed
fitted
1. Inlet valves incorrectly
No water flow
2. Check mains water supply is on
turned on
2. Mains water supply not
fitted check the strainer is not blocked
3. Check for obstructions. If Pack U1 is
supply
3. Blockage in mains water
while.
milkiness will disappear after a short
oxygen bubbles when flowing. The
Water from a pressurised system releases
Oxygenated water
"Milky" water
