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10. Troubleshooting
WARNING
Do not tamper with any of the safety valves
or controls supplied with the cylinder as
this will invalidate any warranty.
Symptom
Water not heating
Discharge of water
from pressure relief
valve (continuously)
Discharge of water
from Pressure relief
valve (intermittently)
Discharge of water
from Temperature /
pressure relief and/
or water/steam from
pressure relief valve
No water flow
'Milky water'
14
Possible cause
A. Electrical supply fault
B. Thermal cut-out tripped
C. Thermostat fault
Excessive mains water pressure
A. Expansion in mains not
possible
B. Mains pressure exceeds 0.41
MPa (4.1 bar)
C. Pack U1 fitted without pack U2
D. Pressure relief valve fault
E. Loss of pressure from
expansion vessel
Thermostat and thermal cut-out
fault
A. Inlet vales incorrectly fitted
B. Mains water supply not turned
on
C. Blockage in mains water
supply
Oxygenated water
10.1 Fault finding
Disconnect the electrical supply before removing the
terminal cover. It is recommended that any service
operations on the product are carried out by a
competent person.
Remedy
A. Check electrical supply
B. Check cut-out, if operated reset and check
thermostat operation. If necessary replace
thermostat/thermal cut-out (see wiring diagram)
C. Check thermostat operation. Replace if
necessary
Fit Pressure reducing valve Pack U1 and U2
(see important installation points)
A. Fit pack U2 (see important installation points)
B. Fit packs U1 and U2
C. Fit pack U2 when using pack U1
D. Replace pressure relief valve
E. Check and if necessary re-charge Expansion
vessel pre-charge pressure (see section 9)
Replace thermostats and thermal cut-outs
A. Check all vales are correctly installed in
accordance with flow direction arrows
B. Check mains water supply is on
C. 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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