All Models; Auto Ignition Units Standard Range - andrews 24/39 Installation And Service Manual

8.2

All models

Fault
HEATER SOOTING,
YELLOW FLAME
(POOR COMBUSTION)
WATER
TEMPERATURE
TOO HIGH
WATER
TEMPERATURE
TOO LOW
NOT ENOUGH
HOT WATER
WATER DRIPPING
FROM BASE OF
HEATER
RUMBLING NOISE
8.3

Auto ignition units standard range

Fault
NO IGNITION AT
PILOT
PILOT LIGHTS BUT
MAIN BURNER
DOES NOT
Issue 2 14/07/16
Action
(a) Check gas burner pressure and injector size. If possible, check heat input with meter and watch.
(b) Clean burners and injectors.
(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.
Action
(a) Check gas service cock is open.
(b) Electrical ON/OFF switch is not ON.
(c) Power to unit interrupted.
(d) Thermostat set too low.
(e) Check ECO for failure. Reset.
(f) Check for 24V AC at intermittent pilot ignition control terminal No. 1. Replace control if faulty.
(g) Faulty Solenoid Coil. Replace if faulty.
(a) Check for 24V AC at intermittent pilot ignition control terminal No. 3. Replace control if faulty.
(b) Faulty Solenoid Coil. Replace if faulty.
Fault Finding 8
55