Installation and Maintenance Manual

46 GTND-SVX01B-EN
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 11. Troubleshooting guide
Symptoms Possible Cause(s) Corrective Action
A. Flame pops back. 1. Burner orifice incorrect. 1. Check for proper orifice size. Refer to “All Unit Sizes:
Operation,” p. 39.
2. Low manifold pressure. 2. Test and reset manifold pressure.
B. Noisy flame. 1. Irregular orifice causing whistle or
resonance.
1. Replace orifice.
2. Excessive gas input. 2. Test and reset manifold pressure.
C. Yellow tip flame (some yellow
tipping on propane gas is
permissible).
1. Clogged burner(s). 1. Clean main burner ports.
2. Misaligned orifice(s). 2. Align manifold assembly.
D. Floating flame. 1. Blocked venting. 1. Clean flue. Refer to “Installation: Piping,” p. 21.
2. Insufficient combustion air. 2. Clean combustion air inlet openings.
3. Blocked heat exchanger. 3. Clean heat exchanger. Refer to “Installation: Mechanical,”
p. 16.
4. Air leak into combustion chamber,
flue collector, or draft hood.
4. Determine cause and repair accordingly.
E. Gas Odor. 1. Shut off gas supply
immediately!
1. Inspect all gas piping and repair.
2. Leaking gas test port on valve. 2. Check to ensure gas test ports are seated.
3. Blocked heat exchanger. 3. Clean heat exchanger/flue.
4. Negative pressure in building. 4. See “Installation: Piping,” p. 21.
5. Blocked flue collector and/or draft
hood.
5. Clean flue collector and/or draft hood.
F. Delayed ignition. 1. Improper ground. 1. Check grounding wires and spark bracket connections.
2. Bad or broken spark cable. 2. Inspect spark cable connections and cuts.
3. Faulty control. 3. Check to ensure spark is energized after pre purge period.
4. Manifold pressure set too low. 4. Test and reset manifold pressure. Refer to “All Unit Sizes:
Operation,” p. 39.
5. Main burner orifice(s) dirty. 5. Clean or replace orifice(s).
6. Improper venting. 6. Refer to “Installation: Piping,” p. 21.