Carlin 601GAS Inst Manual - Manual (Page 21)

Model 601GAS burner — Instruction manual
Carlin part number MN601GAS Rev. 04/24/09
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Where appliance instructions differ from this manual, follow the appliance instructions.
7. Troubleshooting
Problem Possible
cause
Corrective action
WARNING
These procedures must only be performed by a qualified service technician. Use care
when performing tests on electrically or mechanically live parts. Disconnect power to
burner/appliance and close main manual gas valve when removing components for ser-
vice. Failure to comply could result in severe personal injury, death or substantial property
damage.
Burner motor will not
start 120 VAC power cir-
cuits Check voltage and polarity at entrance to appliance and burner. Check fuse or breaker
protecting circuit. Check appliance limit circuit — are controls calling for heat? Check elec-
trical connections.
Primary control is in
Lockout Red LED will be on. Press the reset button for 1 second. If red LED comes back on in a
couple of seconds, probably either there is voltage present to the gas valve or the motor
relay contacts are stuck in the closed position. The Safety Monitoring Circuit causes lock-
out if this occurs. If there is no voltage present at the gas valve (using a voltmeter), replace
the control. If there is voltage at the gas valve, check all wiring for accuracy. Replace the
control if the 60200FR gas valve wire shows 120
VAC when disconnected from the burner
wiring.
Primary control is in
Latch-up Red and amber LED’s will both be on. See page 17 for the procedure to handle this condi-
tion. When resetting the 60200FR control from Latch-up, be sure to investigate what
caused the repeated failures. Correct the condition.
Incorrect wiring Check wiring against appliance and burner wiring diagrams. Verify all connections are
secure.
Defective motor Remove motor leads from the burner junction box and apply power directly. If motor fails to
operate, then replace.
Defective primary
control If control receives power to both the black and red/white wires, but doesn't start the motor,
the control may be defective. Replace control.
Flange door switch Make sure flange door is closed securely and that door switch is closed.
Gas pressure Check low gas pressure switch. If it is open, gas supply may be too low or no gas flow —
check supply line and manual valves. Gas train inlet pressure should be at least 5” w.c.
when burner is operating.
Check high gas pressure switch. It should be closed. If it is open, gas pressure to manifold
may be too high.
Repeated flame fail-
ures — burner won't
light Airflow problem Check air setting against Table 1a, page 9. Reposition to correct setting if necessary.
Check blower wheel to verify it is turning.
Gas orifice Check gas orifice size. See Table 1a, page 9.
Manifold pressure Check gas manifold pressure — should be between 3.2 and 3.8 inches w.c.
Ignition — no spark or
poor spark Check wire connections to ignition electrodes at primary control and electrode ends.
Check position of ignition electrodes per page 11. Adjust if needed.
Check voltage to ignitor. If ignitor receives 120 VAC and doesn't generate spark, replace
ignitor.
Gas valves not open-
ing Check gas supply pressure to gas train. Pressure in excess of 14 inches w.c. will cause
valves to lockup.
Check voltage to gas valves. Are gas valves receiving 120 VAC? If gas valves are receiving
120 VAC and not opening, and gas supply pressure is below 14 inches w.c., replace gas
valve(s).
Airflow switch Check electrical connections and sensing connections to airflow switch. If blower oper-
ates, check across switch to see if it makes.
If switch is correctly connected, but won’t close, replace airflow switch.
To verify switch is receiving signal, connect a manometer across the sensing lines.
Primary control defec-
tive Check voltage to gas valves during TFI. If no voltage to valves, replace the primary control.