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Dayton Operating Instructions and Parts Manual
15
Model 3VG79A
Version B - For Reduction G016.J
®
Troubleshooting Chart
Possible Cause(s)
Corrective Action
Never service heater while it is plugged in, operating, or hot.
Severe burns and electrical shock can occur.
Heater ignites, but flame-out control shuts
off heater after a short period of time
1. See Pump Pressure Adjustment, page 6
2. See Air Output, Air Intake and Lint
Filters, page 6
3. See Fuel Filter, page 7
4. See Nozzle, page 8
5. Clean photocell lens
6. Replace flame-out control
1. Wrong pump pressure
2. Dirty air output, air intake and lint filters
3. Dirty fuel filter
4. Dirt in nozzle
5. Dirty photocell lens
6. Bad flame-out control
Symptom
Heater will not ignite, but motor runs for a
short period of time
1. Wrong pump pressure
2. Improper spark plug gap/position or
carbon deposits across gap.
3. Dirty fuel filter
4. Dirt in nozzle
5. Water in fuel tank
6. Bad fuel valve
7. Electronic ignitor not
grounded
8. Bad electronic ignitor
1. See Pump Pressure Adjustment, page 6
2. See Spark Plug, page 7
3. See Fuel Filter, page 7
4. See Nozzle, page 8
5. Drain and flush fuel tank with clean
kerosene. See Storing, Transporting, or
Shipping, page 9
6. See Fuel Valve, page 7
7. Make sure electronic ignitor mounting is
tight
8. Replace electronic ignitor
High Voltage!
Motor does not start when heater is
plugged in, fan rotates slowly or does not
turn
1. Flame-out control not reset
2. Thermostat setting is too low
3. Solid state relay not allowed to reset
4. Binding pump rotor
1. Press flame-out control reset button
2. Turn thermostat knob to a higher setting
3. Wait two minutes before trying to
restart heater
4. If fan is hard to turn, see Pump Rotor,
page 8