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Version B - For Reduction G016.J
®
7
Model 3VH18A - Propane
Model 3VH19A - Natural Gas
Dayton Operating Instructions and Parts Manual
Troubleshooting Chart
Symptom
Possible Cause(s)
Corrective Action
Burner fails to light
Burner lights but goes out when automatic
control valve button is released
Burn rate is low, emitter does not glow
Flames are extremely high and coming
from emitter
1. (Propane model only) Propane supply
valve closed on propane tank(s)
2. (Propane model only) 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. Blockage in burner orifice
3. Low gas pressure
4. Low fuel supply
1. (Natural gas model only) Unit has been
connected to propane gas instead of
natural gas
1. (Propane model only) Open propane
supply valve slowly
2. (Propane model only) Close propane
supply valve on propane tank and
reopen slowly
3. Replace burner orifice
4. Assure ignitor electrode gap is .15".
Check wire lead for damage. Replace
piezo ignitor and/or ignitor electrode as
necessary
1. Relight, hold automatic control valve
button in for 45 seconds
2. (Propane model only) Check propane
tank(s) for proper gas supply
(Natural gas model only) Check natural
gas supply
3. Tighten connection or replace thermo-
couple
4. Replace automatic control valve
1. Slightly depress control knob and rotate
counterclockwise to the HIGH position
2. Replace burner orifice
3. Check gas supply; check regulator
output
4. Consult gas supplier
1. (Natural gas model only) Check gas
source and replace with natural gas
supply
Never attempt to service heater while it is connected to gas supply, operating, or hot. Severe burns can
occur.