Remington HH-70T-KFA Service Manual download pdf (Page 7)

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Oil Heater Service Info.

DESA Service Information

Low Pressure Solid State Oil Heaters

Helpful Hints For Problems

PROBLEM POSSIBLE CAUSE REMEDY

Pulsation or 1. Low fuel level or unit not level 1. Level unit. Keep tank filled.

uneven firing 2. Air leak 2. Check air & fuel lines for air leaks.Filter not tight. No filter

gasket.

3. Water in fuel 3. Drain, flush & refill with clean,water-free fuel

4. Low air pressure 4. Adjust air pressure. Clean or replace air filters.

5. Nozzle leaking air into oil passages 5. Replace nozzle seal/O-Ring

Motor does not start 1. No power to unit 1. Check outlet & fuse. Check power cord for good contact.

2. Defective motor 2. Replace motor

3. Circuit breaker tripped 3. Depress reset button

4. Loose circuit breaker connections 4. Check terminals on circuit breaker for good contact

5. Defective circuit breaker 5. Replace circuit breaker

Motor runs slowly 1. Low voltage 1. Check voltage. Check length & size of extension cord

2. Tight compressor 2. With unit unplugged turn fan by hand. If fan does not turn

freely, adjust compressor ring.

3. Motor defective 3. With unit unplugged fan turns freely. Replace motor

Cannot adjust 1. Air leak 1. Check air line, replace with O.E.M. airline if necessary. No “O”

air pressure ring between filter body & compressor plate. Filter gasket not in

place.

2. Air line fitting or filter body loose 2. Tighten

3. Compressor ring out of adjustment 3. Adjust gap between rotor and compressor ring. Gap too wide.

4. Plugged nozzle 4. Clean

5. Defective nozzle seal 5. Replace

6. Dirty output filter 6. Clean filter or replace

7. Dirty seat for ball in relief valve or 7. Clean relief valve and seat. Replace valve ball.

dirty relief valve ball

8.Spring in relief valve stuck or defective 8. Replace spring and ball

9. Worn or broken compressor vanes. 9. Replace rotor and vanes

10.Rotor worn 10. Replace worn rotor and blades

Runs indoors, not

outdoors in 1. Water in fuel 1. Drain, flush & refill with clean water-free fuel

cold weather 2. Improper fuel 2. If weather is below 0˚F (-18˚C) kerosene should be used as fuel.

It may also be necessary to add a de-icer.

3.Low air pressure 3. Adjust pressure. Clean or replace air filters. Check for air leaks.

4. Incorrect nozzle or spark plug adjustment 4. Adjust nozzle spacing. Check spark plug alignment

Heater starts then 1. Low fuel level. 1. Check that sufficient fuel is in fuel tank

shuts off, does not 2. Defective transformer 2. Replace

fire. 3. Dirty or plugged nozzle 3. Clean nozzle

4. Low air pressure 4. Clean filters & or nozzle. Adjust proper air pressure

5. Loose connectors 5. Check transformer-to-spark plug wire. Check fuel & air lines.

6. Defective spark plug 6. Check for wear or adjust properly/replace.

7. Water in fuel 7. Drain , flush , & refill tank.

Flames shoot from 1. Wrong Fuel 1. Use proper fuel only

end of heater. 2. Excess air pressure 2. Adjust pressure

3. Improper air flow 3. Dirty or loose fan, air entrance at rear of heater blocked

4. Air leak in oil line 4. Replace

Excessive spark 1. Incorrect nozzle-to-spark plug spacing 1. Replace spark plug. (Nozzle adapter pulled back to far)

plug wear. 2. Excessive air pressure 2. Adjust air pressure

Smoking or odors 1. Dirty filters 1. Clean or replace

2. Low air pressure 2. Adjust to proper setting. Check for air leaks

3. Contaminated or incorrect fuel 3. Drain fuel tank, flush and fill with clean fuel. Use proper fuel

4. Insufficient air flow 4. Check that fan is tight on shaft. Check for dirt in fan or burner

area or blocked air entrance.

5. Dirty nozzle 5. Clean nozzle

Phone: 800-362-6951 • Fax: 800-255-7985

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Remington HH-70T-KFA Service Manual Page 7

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