0505T2D0GBEN
16/21
SECTION 9. FAULT FINDING
THE APPLIANCE WILL ONLY OPERATE WITH ALL PANELS CORRECTLY FITTED !!
9.1
Burner does not ignite
-
Thermostat set too low or time switch not correctly
set; no power to terminals 2 and 5.
- Fuse F3 has blown; no power to terminal 2 and LC3.
- Reference tube to differential air pressure switch S3
is not airtight or blocked.
- Faulty differential air pressure switch S3; no power to
terminals 2 and 13.
- Insufficient differential pressure in flue pipe system;
Flue blocked or too long.
- Burner relay in lockout (point 2 below) or faulty.
- Faulty combustion air fan M3 (venter).
- Faulty limit control LC1; no power to terminal 2 and
LC1.
- Overheat control LC3 in lockout; no power to terminal
2 and LC3; Reset manually.
9.2
Flame relay in lockout
- Air in gas service; purge.
- Low gas pressure.
- Faulty hot surface igniter.
- Faulty differential air pressure switch.
- Gas valve does not open; no power to terminals 2
and 7.
- Insufficient ionisation flame current; ionisation current
$
2
µ
A.
- Incorrect wiring of mains input line, neutral, earth.
9.3. Combustion air fan (venter) does not start
- Faulty motor or capacitor.
- Faulty burner relay.
- Differential air pressure switch S3 still in normal run
position no change-over.
- Faulty fuse F3.
9.4 Differential air pressure switch switches
burner off
- Switch-point should be; ON 1,02 mbar, OFF 0,94
mbar, except type..25/26: ON 0,76 mbar, OFF 0,68
mbar.
- No differential pressure in flue gas system; check flue
and air inlet.
- Faulty combustion air fan or capacitor.
9.5
Appliance does not provide sufficient warm
air
- Check gas inlet pressure.
- Check burner pressure.
- Gas filter (if fitted) dirty or blocked.
- Limit control (LC1) switches burner off (see 9.6).
- Differential pressure switches relay off (see 9.4).
9.6
Limit control LC1 switches burner off
- Switch
temperature
51,5
E
C, ..55/56....95/96 top
connection: 63
E
C.
- Insufficient air flow.
- Vertical and horizontal louvres set in closed position.
-
Burner overload, check burner and inlet gas
pressure.
- Fan control switch faulty
- Check fan rotational direction.
- Air temperature at fan inlet too high; T max. 30
E
C
(see 9.6).
-
Thermal contact in fan motor switches off
intermittently.
9.7
Limit control LC3 switches
- Switch temperature 96
E
C (+0/-5).
- Check location and security of capillary and probe.
- Air discharge temperature too high (see 9.6).
- Faulty limit control LC1.
- Air fan stops immediately after burner is switched off;
incorrect control/s wiring.
- Faulty fan control (FC).
9.8
Air fan does not start
- No power to terminals 2 and 11.
- Faulty fan control (FC).
- Faulty motor or capacitor.
- Thermal over-load in motor switching.
9.9 Fan starts and stops intermittently while
burner is on.
- Faulty heat anticipator (FCR) in fan switch.
- Thermal over-load in motor switching.
- Inlet ambient air temperature too low; T min. <5
E
C.;
will correct as space temperature rises.
- Faulty wiring connection; loose terminals!
