Measurement:

SELECT APPROPRIATE FAULT CODE
Note:
Fault code 1 is also the sequence displayed when the boiler has a demand,
only select this option if it is being displayed WITHOUT a demand present,
otherwise use the full diagnostic model.
1: LOW / ZERO SYSTEM PRESSURE
2: PRIMARY THERMISTOR / IGNITION LOCK OUT
3: NO POWER
4: DHW THERMISTOR
5: OVERHEAT STAT
6: COMBUSTION TEST MODE
7: SARA FUNCTION ACTIVE