11
FAULT FINDING
Use the relevant flowcharts to troubleshoot non-working NXM2Gs.
Typical faults with flowchart guides to resolving the problems are:
1. Electrical Supply Fault NXM2G Power (Red) LED off – follow flowchart in Figure 7.1
2. NXM2G Power supply correct (red LED on) however, boiler is not firing during “
first firing
” –
follow flowchart in Figure 7.2
3. Boiler/Burner fires during “first firing” only and will not re fire thereafter – follow flowchart in
Figure 7.3
4. Boiler/Burner fires in normal way, without NXM2G operating in “Save” mode after first firing –
follow flowchart in Figure 7.4
5. NXM2G Operates Boiler/Burner but
Thermostat on
and
Boiler firing
LED’s remain on, when
the boiler is not firing – follow flowchart in Figure 7.5
FIGURE 7.1
Electrical Supply Fault NXM2G Power (Red) LED off
