All Models - andrews 32/143 Installation Manual, Operation And Service Manual

SECTION 8

ALL MODELS

FAULT FINDING
FAULT ACTION
HEATER SOOTING, (a) Check gas burner pressure and injector size. If possible,
YELLOW FLAME
(POOR COMBUSTION) (b) Clean burners and injectors.
(c) Flue obstruction. Clean flue ways.
(d) Check flue design and termination position.
(e) Check for correct ventilation.
WATER TEMPERATURE (a) Reset thermostat to lower temperature.
TOO HIGH (b) Thermostat faulty. Check and replace if necessary.
(c) Main gas valve not closing. Clean or replace.
WATER TEMPERATURE (a) Reset thermostat to higher temperature.
TOO LOW (b) Check gas pressures at burner and at gas inlet to heater.
(c) Thermostat faulty. Check and replace if necessary.
NOT ENOUGH (a) Check gas pressures at burner and at gas inlet to heater.
HOT WATER (b) Check amount of water being used against recovery rate
WATER DRIPPING (a) Check if this stops when water in heater is hot. If yes, then
FROM BASE OF
HEATER
(b) If water continues to drip when heater is hot, problem is
RUMBLING NOISE (a) Scale formation in heater, consult water treatment
check heat input with meter and watch.
given on data plate. If usage too high, more heating
capacity needed.
condensation is the problem caused by incorrectly designed
flue or by tank cooling excessively, i.e. more hot water
being used than recovery rate of heater. If so, more
heating capacity needed.
leaking joint or storage vessel.
specialist. Heater must be descaled and suitable water
treatment provided to avoid re-occurrence.
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