andrews RFF190 Installation Manual, Operation And Service Manual page 28

FAULT FINDING
FAULT
WATER
TEMPERATURE
TOO HIGH
WATER
TEMPERATURE
TOO LOW
NOT ENOUGH
HOT WATER
WATER DRIPPING
FROM BASE OF
HEATER
RUMBLING NOISE
ACTION
(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.
SECTION 7
23