9801ST00AMEN
16
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 0,99 mbar, OFF 0,94
mbar, type..35/36: ON 0,74 mbar, OFF 0,69 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
°
C, ..55/56....95/96 top
connection: 63
°
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
°
C
(see 9.6).
-
Thermal contact in fan motor switches off
intermittently.
9.7
Limit control LC3 switches
-
Switch temperature 96
°
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
°
C.;
will correct as space temperature rises.
-
Faulty wiring connection; loose terminals!
