Installation and Maintenance Manual

27GBNE-SVX001A-EN
Table 9 - Tubular Propeller Troubleshooting Guide
SYMPTOMS POSSIBLE CAUSE(S) CORRECTIVE ACTION
A. Flame pops
back.
1. Burner orifice too small. 1. Check with local gas supplier for proper orifice size and replace.
Refer to "Gas Input Rate."
B. Noisy Flame. 1. Irregular orifice causing whistle or resonance.
2. Excessive gas input.
1. Replace orifice.
2. Test and reset manifold pressure (see Table 4 - "Gas Piping
Requirements").
C. Yellow tip
flame (some
yellow tipping
on LP gas is
permissible).
1 Clogged main burners.
2. Misaligned orifices.
3. Insufficient combustion air.
4. Possibly over fired.
1. Clean main burner ports.
2. Replace manifold assembly.
3. Refer to "Installation - Clearances" and "Venting" to ensure unit is
properly mounted and vented.
4. Check gas input and manifold pressures.
D. Floating
flame.
1. Blocked venting.
2. Insufficient combustion air.
3. Blocked heat exchanger.
4. Air leak into combustion chamber or flue
collector.
1. Clean flue. Refer to "Installation."
2. Clean combustion air inlet openings.
3. Clean heat exchanger. Refer to "Installation."
4. Determine leak and repair accordingly.
E. Gas odor 1. Gas leak. Shut off gas supply immediately!
2. Leaking gas test port on valve.
3. Blocked heat exchanger.
4. Blocked flue collector.
5. Negative pressure in the building.
1. Inspect all gas piping and repair accordingly.
2. Check to ensure gas test ports are sealed.
3. Clean heat exchanger. Refer to "Installation."
4. Clean flue collector. Refer to "Installation."
5. See "Installation."
F. Delayed
ignition.
1. Improper ground.
2. Bad or broken spark cable.
3. Faulty control.
4. Pressure regulator set too low.
5. Main burner orifices dirty.
6. Improper venting.
1. Check grounding wires and spark bracket connections.
2. Inspect spark cable connections and cuts. Replace if necessary.
3. Check to ensure spark is energized after pre-purge period.
4. Test and reset manifold pressure.
5. Clean or replace orifices.
6. Refer to "Installation."
G. Failure to
ignite.
1. Gas leak. Shut off gas supply immediately!
2. No power supply to unit.
3. Thermostat not calling.
4. Defective high limit.
5. Defective draftor prove switch.
6. Defective spark ignitor, gas valve,
thermostat or transformer.
7. Loose wiring.
8. Improper ground.
9. Improper thermostat or transformer wiring.
1. Open all manual valves, check for leaks.
2. Turn on power supply, check fuses and replace if bad.
3. Turn up thermostat. Check for 24V on terminals R and W1 on
terminal strip.
4. Check switch for continuity if open with no heat present; replace.
5. Check switch operation to ensure switch closes after draftor
purge period. If it does not make, check tubing connections for
blockage.
6. Check for continuity and voltage in safety and control circuits;
replace an item where continuity or voltage not found.
7. Check all wiring per diagram.
8. Check all ground wires and connections.
9. Check both for wiring according to diagram; check for 24V at gas
valve terminals during trial for ignition period. If present and valve
does not open, replace valve.
H. Condensation 1. Improper venting.
2. Unit under fired.
3. Building/space too cold.
1. Refer to "Installation."
2. Check gas supply pressures to unit. Refer to "Installation."
3. Refer to "Installation."
I. Burners will
not shut off.
1. Thermostat located improperly.
2. Improper thermostat wiring.
3. Shorted circuit.
4. Defective thermostat.
5. Defective/sticking gas valve.
6. Defective control board.
7. Excessive gas supply pressure.
1. Relocate thermostat away from outside wall or drafts.
2. Check thermostat circuit for open and close on heater terminal
strip "R" and "W."
3. Check thermostat circuit for shorts or any staples piercing wires.
4. If thermostat is calling after set point has been satisfied, replace.
5. Check for 24V on gas valve terminals when thermostat not
calling. Replace if necessary.
6. Check for 24V at terminals "R" and "W." If not present and board
is not in flash code mode, replace board.
7. Refer to "Pipe Installation" and Table 4 - "Gas Piping
Requirements."
J. Rapid burner
cycling.
1. Loose electrical connections at thermostat
or gas valve.
2. Excessive thermostat heat anticipator
setting.
3. Unit cycling on high limit.
4. Thermostat located improperly.
1. Tighten all electrical connections.
2. Adjust heat anticipator setting for longer cycles. Refer to
"Electrical Connections."
3. Check for proper air supply across heat exchanger and proper
gas supply.
4. Relocate thermostat away from outside wall or drafts.
K. Blower will
not run.
1. Loose electrical connections.
2. Defective motor or overload.
3. Defective control board.
4. Contactor or starter overload tripped.
5. Broken belt.
1. Check and tighten wires on blower circuit.
2. Test for 115V on terminal ACB Heat and "L2." If voltage is present,
replace motor.
3. Test for 115V on terminal ACB Heat and "L2." If voltage is not present 45
seconds after trial for ignition, replace board.
4. Test for 115V on coil of contactor. Check if overload has tripped;
reset. Check amp draw to motor. Check incoming for power and
contactor operation.
5. Replace belt.