TROUBLESHOOTING
(continued)
7.
Main burner will not light – test gas pressure
A. Thermostat not calling for heat
Raise thermostat setting / replace thermostat
B. Check preceding pilot tips
Proceed as required
C. Bad transformer
Replace if 120V in, nothing out. 24V is correct
D. Bad gas valve
Replace by qualified technician
8.
Main burner lights weakly – test gas pressure, tank level
A. L.P. – Inadequate gas tank temperature or evaporation area
B. Tank valve undersized and freezing up.
Increase valve size / capacity
C. Supply piping too small
Increase pipe size
D. Wrong gas type
Check gas type, replace orifices, pilot…
E. Bad gas valve
Replace by qualified technician
F. Poor gas quality
Connect to good gas supply
G. Gas pressure too low to unit
Increase line pressure
H. Too many heaters on an inadequate supply line
Re-engineer full “Heater On” gas demand
9.
Main burner lights harshly, delayed ignition
A. Gas pressure too high
Decrease gas pressure, see “Robertshaw Installation Data”
B. Wrong gas type
Check gas type, replace orifices, pilot…
C. Bad gas valve
Replace by qualified technician
D. Pilot too small
See pilot troubleshooting section
E. Incorrect orifices
Check correct orifice size, replace as required
20
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