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Table 2 - Fault Finding Chart
FAULT
No hot water flow
Water from hot taps is
cold
Water discharges
from Expansion Relief
Valve
Water discharges from
T&P Relief Valve
"Milky" water
POSSIBLE CAUSE
1. Mains supply off
2. Strainer blocked
3. Cold Water Combination
Valve incorrectly fitted
1. DIRECT immersion
heater not switched on
2. DIRECT immersion
heater thermal cut-out has
operated
3. INDIRECT programmer
set to Central Heating only
4. INDIRECT boiler not
working
5. INDIRECT thermal cut-
out has operated
6. INDIRECT motorised
valve not connected
correctly
1. INTERMITTENTLY
Expansion vessel charge
pressure has reduced below
3.5 bar
2. CONTINUALLY
a. Cold Water Combination
Valve Pressure Reducer not
working correctly
b. Expansion Valve seat
damaged.
1. Thermal control failure
NOTE water will be very hot
Oxygenated water
REMEDY
1. Check and open stop cock
2. Turn off water supply.
Remove strainer and clean (see
Section 8.3)
3. Check and refit as required
1. Check and switch on
2. Check. Reset by pushing
button. (See Diagram 7)
3. Check. Set to a Domestic
Hot Water programme
4. Check boiler operation. If fault
is suspected consult boiler
manufacturer's instructions
5. Check. Reset by pushing
button on cut-out. Check
operation of indirect thermostat
6. Check wiring and/or plumbing
connections to motorised valve
(see Diagram 9)
1. See Section 7.5 for re-
charging procedure
a. Check pressure from Cold
Water Combination Valve. If
greater than 3 bar replace
Pressure Reducer cartridge
b. Remove Expansion Valve
cartridge. Check condition of
seat. If necessary fit new
Expansion Valve cartridge.
1. Switch off power to
immersion heater(s) and shut
down boiler. DO NOT turn off
water supply. When discharge
stops check all thermal
controls, replace if faulty.
Water from a pressurised
system releases oxygen
bubbles when flowing. The
milkiness will disappear after a
short while.
31
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