Seeley International Pty Ltd

The BSC has detected that heat exchanger over temperature switch 2 (HX OT2, 130 C) is  open at start-up and heat exchanger over-temperature switch 1 (HX OT1, 80, 90 or 110 C) is closed - the system goes to 'lockout 2' and can only be reset using a Braemar SCC from  service mode. This switch is connected in the 24V supply line to the gas valve on/off coil - if 

it is open the heater cannot operate. This indicates that either or both HX OT1 or HX OT2 is

faulty - both switches should be replaced.

• Check wiring - reconnect if required.

• REPLACE BOTH HX OT1 and HX OT2:

After replacing both switches check system for normal  operation and normal air flow rates. 

• Wiring disconnected from HX OT2.

• Faulty HX OT1 (switch does not open when hot),  and/or faulty HX OT2 (switch open when cool)

Poor airflow due to restrictive ductwork - check ductwork guidelines have been followed 

After the fault has been rectified, reset from service mode as follows:

• Press the ON/off button to turn the SCC off.

• Open door on SCC.

• To enter service mode press and hold 'zone 3' button for 5 seconds.

• Wait 5 seconds - latest recorded diagnostic code will display with 'F01', 'RESET' will flash.

• Press and hold the small recessed 'door button' and press the 'RESET' button.

• To clear recorded codes press and hold the 'FAN' button for 5 seconds.

• To exit service mode close the door on the SCC and press the ON/OFF button.