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Check: 1. Is the correct receiver connected? (B6R-RAPT2)
2. Check if the 8-pin wire between the receiver and gas control block - is not connected - has a bad contact - has loose wires within the connector Check by pulling wire by wire on both the receiver and gas control block ends.
3. Wiring of the thermocouple circuit is broken. Check the thermocouple, thermocouple interrupter and wiring (see HERE for instructions)
4. Has 2nd thermocouple cooled down sufficiently? Wait until it has cooled sufficiently (voltage should measure < 1.2mV between the black extension wire and earth)
5. Is wiring of 2nd thermocouple interrupted?
If they are all connected and it still does not work, the receiver is defective and has to be replaced.