11
INSSEFECMI0513
pRoBlem
defecTive paRT oR paRT To check
The unit does not work
- Defective thermostat, wrong thermostat setting or positionning
- Open circuit breaker or fuse
- Faulty connections
- Faulty motor or condensator
- Faulty blower control switch
- Faulty transformator
- See above: CONTROL CARD AuTODIAGNOSTIC
The unit runs continuously
- Defective thermostat, wrong thermostat setting or positionning
- Heat losses greater than the unit capacity
- Faulty relay
- Thermostat wire incorrectly connected to the furnace
- See above: CONTROL CARD AuTODIAGNOSTIC
The unit cycles under control of the thermal protection (overheat
indicator)
- Blocked air vents
- Defective motor
Overheating
- Defective thermostat, wrong thermostat setting or positionning
- Defective motor
The breaker trips when the heater is turned on
- Faulty connections
- Voltage higher than that indicated on the nameplate
Elements are on, but the motor does not work
- Defective motor or condensator
- Faulty relay
The desired room temperature cannot be reached
- One or more defective elements
- Defective thermostat or wrong thermostat setting
- Voltage lower than that indicated on the nameplate
- Heat losses greater than the unit capacity
- Faulty relay
ConTroL CArD AuToDiAgnosTiC
The control card of the furnace is equipped with three LED pilot lights
that allow easy and quick diagnostic of its essential functions. They
are located at the bottom left of the control card (see illustration).
HEARTBEAT LED PILOT LIGHT
The first LED pilot light from the top is blinking in normal operation; this
is the control card heartbeat. If it is always off or always on, it means
that the card processor has finish running its program. In this case, it is
recommended to reset it by cutting off the power supply of the furnace
at the circuit breaker for at least ten seconds and then reactivating it.
If the heartbeat LED pilot light is still not blinking, replace the control
card.
5 VDC LED PILOT LIGHT
If on, the second LED pilot light indicates that the internal electronic
circuit is supplied by a 5 VDC power source. If this pilot light is off when
the 24 V LED pilot light is on, there is a problem. In this case, you must
replace the control card.
24 V LED PILOT LIGHT
The last LED pilot light indicates that the card is supplied by a 24 V
power source. If it is not on, it means that there is a problem with the
electrical supply upstream the card. In this case, check the primary
and secondary circuit voltages of the 24 V transformer.
DIAGNOSTIC
led
S LOCATION ON CONTROL CARD
troubleshooting
Summary of Contents for SEFECM Series
Page 14: ......
