Dayton 3VH18A, 3VH19A instruction manual Troubleshooting Chart

Never attempt to service heater while it is connected to gas supply, operating, or hot. Severe burns can

occur.

Symptom

Possible Cause(s)

Corrective Action

Burner fails to light

1. (Propane model only) Propane supply

1. (Propane model only) Open propane

valve closed on propane tank(s)

supply valve slowly

2. (Propane model only) Excess flow check

2. (Propane model only) Close propane

valve closed

supply valve on propane tank and

reopen slowly

3. Blockage in burner orifice

3. Replace burner orifice

4. Piezo ignition system not sparking

4. Assure ignitor electrode gap is .15".

Check wire lead for damage. Replace

piezo ignitor and/or ignitor electrode as

necessary

Burner lights but goes out when automatic

1. Not enough warm-up time

1. Relight, hold automatic control valve

control valve button is released

button in for 45 seconds

2. Low gas pressure

2. (Propane model only) Check propane

tank(s) for proper gas supply

(Natural gas model only) Check natural

gas supply

3. Thermocouple loose or needs to be

3. Tighten connection or replace thermo-

replaced

couple

4. Automatic control valve needs to be

4. Replace automatic control valve

replaced

Burn rate is low, emitter does not glow

1. Burner control is on Low

1. Slightly depress control knob and rotate

counterclockwise to the HIGH position

2. Blockage in burner orifice

2. Replace burner orifice

3. Low gas pressure

3. Check gas supply; check regulator

output

4. Low fuel supply

4. Consult gas supplier

Version B - For Reduction

G016.J