DV425TR DIRECT VENT ROOM HEATER
TROUBLE SHOOTING (continued)
| PROBLEM |
| POSSIBLE CAUSE: |
| SOLUTIONS: |
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| Pilot will not Hold |
| Defective Magnet |
| If the mV reading is above 6mV and the Safety Magnet does |
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| (Cont.) |
| (mV Plus systems). |
| not hold, replace the Valve. |
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| (E) If |
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| Circuit reading, the Coil is electrically "Open". Replace the |
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| Valve. |
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| Defective Safety Magnet |
| Verify operation of Safety Magnet in the following manner: |
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| (milliVolt System) |
| (A) Remove all Wires from the Terminals of the Main |
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| Operator. |
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| (B) Measure the electrical voltage between the Termihals |
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| TPTH and TP. If the voltage is above 110mV and the Safety |
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| Magnet does not hold, replace the Valve. |
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| Pilot Drops Out. |
| Pilot Orifice blocked. |
| Replace Orifice with a new Orifice of the exact size and type. |
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| Wrong Pilot Orifice. |
| Replace the Orifice with a new Orifice supplied specifically |
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| for the appliance and gas in question. |
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| No gas to Main |
| Low gas pressure to |
| Check Gas Pressure (&" NG/11"LP) |
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| Burner |
| appliance. |
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| Pilot not lit. |
| Light Pilot and wait for |
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| sufficiently to power the Main Operator. If Pilot fails to light, |
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| hold, hold, refer to the above sections. |
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| Control Knob in the "ON" |
| Rotate "OFF/PILOT/ON" Control Knob to the "ON" position. |
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| position. |
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| Thermostat/Wall |
| Thermostat not in the "ON" |
| Turn Thermostat "ON" and then adjust Temperature Control |
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| Switch will not |
| position. |
| to call for heat. |
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| cycle the Main |
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| Burner. |
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| If unable to meet minimum requirements, replace the |
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| voltage not within design |
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| parameters. |
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| Defective Thermostat or |
| (A) With the apilot adjusted properly, place a Jumper Wire |
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| Thermostat Wiring. |
| between TPTH and TH. Take a mV reading across the TPTH |
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| and TH Terminals of the Valve. This Closed Circuit voltage |
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| should not fall below 300mV. Record reading. |
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| (B) Remove Jumper wire from the TPTH and TH conections |
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| and connect the Thermostat Wires to the same Terminals. |
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| Closed Circuit voltage as described in the previous Step. If |
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| the mFV reading drops below 150mV, excessive resistance |
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| exists in the Thermostat Circuit and must be isolated and |
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| eliminated. |
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| Defective Wall Switch. |
| Repeat the above troubleshooting items covered under |
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| "Defective Thermostat or Thermostat Wiring" except, |
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| substitute the words "Wall Switch" where the word |
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| Thermostat appears in the instructions. |
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02/01 | Page 55 |
