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8.1 intErmittEnt WAtEr diScHArGE
8 fAULt findinG
Section 8: fault finding
Page 29
Yes
Intermittent water discharge
from T&P valve
Expansion vessel charge
reduced
Test vessel and recharge or
replace
Thermostat failure
Immersion thermostat failure
Repair or replace immersion
thermostat
Primary cylinder thermostat
Faulty T&P valve
Repair or replace thermostat
Replace T&P valve
Repair or replace immersion thermostat
No
No
No
Yes
Yes
Yes
8.2 conStAnt WAtEr diScHArGE
Constant water discharge from
T&P valve
Expansion vessel charge
reduced
Faulty T&P valve
Faulty pressure reducing valve
Test vessel and recharge or
replace
Replace T&P valve
Replace pressure reducing
valve
No
No
No
Yes
Yes
Yes
Yes
Yes
Test for correct operation. If water is still discharging, contact a
competent engineer