Fault Finding - Heatrae Sadia Hotflo 10 Fitting Instructions And User Manual

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.
FAULT
Water not heating
Discharge of water from
Pressure Relief Valve
(continuously)
Discharge of water from
Presure Relief Valve
(intermittently)
Discharge of water from
Temperature/Pressure
Relief Valve and or
water/steam from
Pressure Relief Valve
No water flow
"Milky" water
POSSIBLE CAUSES
1. Electrical supply fault
2. Thermal cut-out tripped
3. Thermostat fault
Excessive mains water
pressure
1. Expansion in mains not
possible
2. Mains pressure exceeds
4.1 bar (60 p.s.i.)
3. Pack U1 fitted without
Pack U2
4. Pressure Relief Valve Fault
5. Loss of pressure from
Expansion Vessel
Thermostat and thermal
cut-out fault
1. Inlet valves incorrectly
fitted
2. Mains water supply not
turned on
3. Blockage in mains water
supply
Oxygenated water
ACTION
1. Check electrical supply
2. Check cut-out, if operated reset and
check thermostat operation. If necessary
replace thermostat/thermal cut-out (see
WiringDiagram, page 8)
3. Check thermostat operation, replace if
necessary
Fit Pressure Reducing Valve Pack U1 and
U2 (see IMPORTANT INSTALLATION
POINTS, page 4)
1. Fit Pack U2 (see IMPORTANT
INSTALLATION POINTS, page 4)
2. Fit Packs U1 and U2
3. Fit Pack U2 when using Pack U1
4. Replace Pressure Relief Valve
5. Check and, if necessary, re-charge
Expansion Vessel pre-charge pressure
(see Section 6.5)
Replace thermostat and thermal cut-out
1. Check all valves are correctly installed
in accordance with flow direction arrows
2. Check mains water supply is on
3. Check for obstructions. If Pack U1 is
fitted check the strainer is not blocked
Water from a pressurised system releases
oxygen bubbles when flowing. The
milkiness will disappear after a short
while.
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