Dayton Operating Instructions and Parts Manual
Model 3VH20
Troubleshooting Chart
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| Never attempt to service heater while it is connected to propane supply, operating, or hot. Severe burns | |||
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| Symptom | Possible Cause(s) | Corrective Action |
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| Burner fails to light | 1. Propane supply valve closed on propane | 1. Open propane supply valve slowly | |||
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| tank(s) |
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| 2. Excess flow check valve closed | 2. Close propane supply valve on propane | |
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| tank and reopen slowly | |
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| 3. Blockage in burner/valve assembly | 3. Replace burner/valve assembly | |
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| 4. Piezo ignition system not sparking | 4. Assure the ignitor electrode gap is | |
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| .120". Check wire lead for damage. | |
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| Replace piezo ignitor and/or ignitor | |
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| electrode as necessary | |
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| Burner lights but goes out when auto- | 1. Not enough | 1. Relight, hold automatic control valve | |||
| matic control valve button is released |
| button in 45 seconds | |||
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| 2. Low gas pressure | 2. Check propane tank(s) for proper gas | |
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| supply | |
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| 3. Thermocouple loose or bad | 3. Tighten connection or replace thermo- | |
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| couple | |
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| 4. Bad automatic control valve | 4. Replace automatic control valve | |
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| Maximum burn rate is low | 1. Low gas pressure | 1. Check gas supply; check regulator | |||
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| output | |
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| 2. Low fuel supply | 2. Consult propane gas supplier | |
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| 3. Plugged gas orifices | 3. Replace burner assembly | |
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Checking for Correct Burner Flame
Heater shell, top, and heated air
from heater is very hot during opera- tion. Gradually move in closer to heater to observe flame color. Do not touch heater shell or top. Do not get too close to heated air from heater. Severe burns could occur.
Look through the ventilation holes in the top of the heater to see the burner flame. The burner flame should be mostly blue with slight yellow coloring on the ends. If the burner flame is mostly yellow, the primary air openings on the burner tube under the heater base may be blocked (See Figure 7).
1.Stop heater (See To Stop Heater on page 6) and let cool.
2.Turn heater over to locate the primary air openings on the burner tube (See Figure 7). Remove any debris blocking the primary air openings.
Primary Air
Opeinings
Burner
Tube
Figure 7 - Bottom View of Heater
®
7
Version B - For Reduction | G016.J |
