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

SECTION 8

ALL MODELS

42
FAULT FINDING
FAULT
HEATER SOOTING,
YELLOW FLAME
(POOR COMBUSTION) (b) Clean burners and injectors.
WATER TEMPERATURE
TOO HIGH
WATER TEMPERATURE
TOO LOW
NOT ENOUGH
HOT WATER
WATER DRIPPING
FROM BASE OF
HEATER
RUMBLING NOISE
ACTION
(a) Check gas burner pressure and injector size. If possible,
check heat input with meter and watch.
(c) Flue obstruction. Clean flue ways.
(d) Check flue design and termination position.
(e) Check for correct ventilation.
(a) Reset thermostat to lower temperature.
(b) Thermostat faulty. Check and replace if necessary.
(c) Main gas valve not closing. Clean or replace.
(a) Reset thermostat to higher temperature.
(b) Check gas pressures at burner and at gas inlet to heater.
(c) Thermostat faulty. Check and replace if necessary.
(a) Check gas pressures at burner and at gas inlet to heater.
(b) Check amount of water being used against recovery rate
given on data plate. If usage too high, more heating
capacity needed.
(a) Check if this stops when water in heater is hot. If yes, then
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.
(b) If water continues to drip when heater is hot, problem is
leaking joint or storage vessel.
(a) Scale formation in heater, consult water treatment
specialist. Heater must be descaled and suitable water
treatment provided to avoid re-occurrence.