80
aLTERNa TINg ‘F’ aND ‘5’ - RETURN ThERMIsTOR FaULT
Check the resistance using a suitable multimeter
At 25
o
o
o
C expect 1,000 - 1,100 Ohms
NO
81
aLTERNa TINg ‘F’ aND ‘6’ - OUTsIDE sENsOR F aULT
Check the resistance using a suitable multimeter
At 0
o
C expect 31,000 - 35,000 Ohms
At 15
o
At 30
o
Is the wiring securely connected between the
incoming terminal block boiler connection of the
NO
Is the wiring securely connected at both the boiler and
NO
NO
Check and replace wiring as necessary
NO
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