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Model 3VH22
Dayton Operating Instructions and Parts Manual
Troubleshooting Chart
Symptom
Possible Cause(s)
Corrective Action
Burner fails to light
Burner lights but goes out when auto-
matic control valve button is released
Burn rate is low
1. Propane supply valve closed on propane
tank(s)
2. Excess flow check valve closed
3. Blockage in burner orifice
4. Piezo ignition system not sparking
1. Not enough warm-up time
2. Low gas pressure
3. Thermocouple loose or needs to be
replaced
4. Automatic control valve needs to be
replaced
1. Burner control is on Low
2. Plugged gas orifice
3. Low gas pressure
4. Low fuel supply
1. Open propane supply valve slowly
2. Close propane supply valve on propane
tank and reopen slowly
3. Replace burner orifice
4. Assure ignitor electrode gap is .195".
Check wire lead for damage. Replace
piezo ignitor and/or ignitor electrode as
necessary
1. Relight, hold automatic control valve
button in 45 seconds
2. Check propane tank(s) for proper gas
supply
3. Tighten connection or replace thermo-
couple
4. Replace automatic control valve
1. Slightly depress control knob and rotate
counterclockwise to the Medium or
High position
2. Replace gas orifice
3. Check gas supply; check regulator
output
4. Consult propane gas supplier
Never attempt to service heater while it is connected to propane supply, operating, or hot. Severe burns
can occur.