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0108X1DHGBEN 24
SECTION 12 FAULT FINDING
THERMOELECTRIC BURNER CONTROL MODELS
12.1 Ignition burner will not light :
- Read lighting instructions;
- Check gas supply is turned on;
- Air in gas supply : check purging;
- Excessive high/low gas pressure : adjust
throttle screw figs. 11 & 12;
- Blocked ignition burner injector orifice
- Faulty gas valve : renew;
12.2 Ignition burner lights but will not establish
- Loose connection on thermocouple or
reroute leads : check security;
- Ignition burner flame too small : adjust;
- Ignition burner jet dirty : clean;
- Thermal overheat (limit) control LC3 loose
connection on control terminals: check
renew connection as necessary, loose
connection on gas valve;
- Faulty thermocouple : renew;
- Faulty gas valve : renew;
- Faulty overheat (limit) control LC1 or LC3:
renew;
12.3 Ignition burner lights and established but main
burner will not light :
- Check electricity supply switched ON;
- Check room thermostat is calling for heat
: adjust;
- Check time switch if fitted is in ON
mode;
- Open circuit to gas valve : check wiring;
- Faulty gas valve : renew;
- Faulty or loose connection on
thermocouple/LC3: check
- If appliance is fitted with a Euroventer :
check it is operating.
12.4 Main burner lights and goes out after short period
:
- Insufficient combustion air : open door or
window to check air supply;
- Euroventer air flow proving operating when
flue gas is hot : check flue and Euroventer
air proving system;
- Room thermostat in warm air flow : check
temperature around thermostat;
- Room thermostat on vibrating surface :
check contacts chattering near set points;
- Fan rotating slowly, heater operating on
thermal limit control LC1 : check fan
motor, suspect capacitor fault;
- Fan guard blocked with dust to reduce air
flow : clean;
- Discharge louvres closed : open;
- Ambient air temperature too high, set point
reached.
HOT SURFACE IGNITION CONTROL MODELS
12.5 Burner does not light:
- Thermostat set too low;
- Controls fuse has blown;
- If fitted Euroventer not operating;
- Burner relay in lock-out or faulty;
- Faulty thermal over heat (limit) control;
- Thermal over heat control LC3 in lock-out
mode;
- Faulty hot surface igniter;
- Insufficient ionisation flame current : should
be > 2
µ
A;
- Incorrect wiring or bad earth connection.
12.6 Cool air is discharged continuously at start up or
during operation when burner is off? :
- Room thermostat on : set to off;
- Ignition burner is unlit : light up;
- Thermal fan switch faulty : renew switch;
- If fitted manual override fan switch in ON
mode : switch OFF;
12.7 Air circulation fan will not run :
- Open circuit : check;
- Thermal fan control switch faulty : renew;
- Defective fan motor capacitor : renew;
- Defective motor : renew;
12.8 Air circulation fan runs and stops while burner
remains alight :
- Thermal fan switch heat element broken :
renew switch;
- Low ambient temperature : wait, it will
correct as temperature rises;
- Motor thermal overload switch operating :
check motor current rating - renew motor
if faulty;
- Thermal fan control heater element wiring
incorrect : check, correct if necessary;
- Faulty thermal fan control : renew;