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Diagnostics
Troubleshooting
WARNING
Hazardous Service Procedures!
The maintenance and troubleshooting procedures
recommended in this section of the manual could result
in exposure to electrical, mechanical or other potential
safety hazards. Always refer to the safety warnings
provided throughout this manual concerning these
procedures. When possible, disconnect all electrical
power including remote disconnect and discharge all
energy storing devices such as capacitors before
servicing. Follow proper lockout/tagout procedures to
ensure the power can not be inadvertently energized.
When necessary to work with live electrical
components, have a qualified licensed electrician or
other individual who has been trained in handling live
electrical components perform these tasks. Failure to
follow all of the recommended safety warnings
provided, could result in death or serious injury.
Table 8.
Troubleshooting guide
Symptoms
A. Flame lifting from burner ports.
B. Flame pops back.
C. Noisy flame.
D. Yellow tip flame (some yellow
tipping on propane gas is
permissible).
E.
Floating flame.
GMND-SVX01B-EN
Possible Cause(s)
1.
Pressure regulator set too high.
2.
Defective regulator.
3.
Burner orifice too large.
1.
Excessive primary air.
2.
Burner orifice too small.
1.
Too much primary air.
2.
Noisy pilot.
3.
Irregular orifice causing whistle or
resonance.
4.
Excessive gas input.
1.
Insufficient primary air.
2.
Clogged burner ports.
3.
Misaligned orifices.
4.
Clogged draft hood.
5.
Air shutter.
6.
Insufficient combustion air.
1.
Blocked venting.
2.
Insufficient combustion air.
3.
Blocked heat exchanger.
4.
Air leak into combustion chamber
or draft hood.
Corrective Action
1.
Reset manifold pressure. Refer to
2.
Replace regulator section of combination gas valve or
complete valve.
3.
Check with local gas supplier for proper orifice size and
replace. Refer to
"Operation," p.
1.
Close air shutter. Refer to
2.
Check with local gas supplier for proper orifice size and
replace. Refer to
"Operation," p.
1.
Close air shutter.
2.
Reduce pilot gas. Refer to
3.
Replace orifice.
4.
Reset manifold pressure. Refer to
Replace regulator section of combination gas valve or
complete valve; or check with local gas supplier for proper
orifice size and replace. Refer to
1.
Open air shutters. Refer to
2.
Clean main burner ports.
3.
Replace manifold assembly.
4.
Clean draft hood.
5.
Check for dust or lint at air mixer opening and around the
air shutter.
6.
Check for obstruction in combustion air inlet cap and piping;
see
"Installation: Piping," p.
1.
Clean flue. Refer to
"Installation: Piping," p.
2.
Check for obstruction in combustion air inlet cap and piping;
see
"Installation: Piping," p.
3.
Clean heater.
4.
Determine cause and repair accordingly.
"Operation," p.
26.
26.
"Operation," p.
26.
26.
"Operation," p.
26.
"Operation," p.
26;
"Operation," p.
26.
"Operation," p.
26.
16.
16.
16.
35
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