TROUBLE SHOOTING CONTROL BOARD
To improve diagnosing and servicing, this control board is equipped with a self diagnosing green status light (see wiring diagram). To indicate stand by mode and proper operation this light will remain on. If there should be a malfunction, the light will flash a varying number of times with a pause between each series of flashes. The number of flashes will indicate the circuit to check.
# of |
| Reason for Indication | Possible Causes |
| Corrective Action | |
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Flashes |
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1 |
| Failed ignition attempts | Hot Surface Ignitor: | Hot Surface Ignitor: | ||
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| (3 times) | a) | Broken | a) | Replace |
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| This puts heater into one hour | b) | Loose or damaged wire. | b) | Connect or replace wire |
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| lockout mode. This one hour |
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| lockout can be bypassed by | No Gas to Burner: | No Gas to Burner: | ||
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| resetting the thermostat. | a) | Valve in “OFF” position. | a) | Turn to “ON” |
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| b) | Gas supply turned OFF. | b) | Open gas supply valve. |
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| c) | Loose or damaged wire to valve. | c) | Connect or replace wire. |
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| d) | Defective or dirty flame sensor. | d) | Replace or clean sensor. |
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2 |
| Pressure switch stuck closed | Defective switch. | Replace switch. | ||
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3 |
| Pressure switch failed to close | a) | Vacuum hose disconnected or damged. | a) | Reconnect or replace vacuum hose. |
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| b) | Defective switch. | b) | Replace switch. |
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| c) | Wire disconnected or damaged. | c) | Connect or replace wire. |
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| d) | Obstruction in vent pipe. | d) | Remove obstruction. |
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4 |
| Limit switch circuit open | a) | Defective limit switch. | a) | Replace limit switch. |
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| b) | Disconnected or damaged wire. | b) | Replace or connect wire. |
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5 |
| Gas valve energized with no | a) | Defective gas valve. | a) | Replace gas valve. |
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| call for heat | b) | Sensor defective. | b) | Replace sensor. |
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| c) | Short in sensor wire. | c) | Replace sensor wire. |
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6 |
| Polarity reversal | a) | Hot and neutral electrical supply | a) | Unplug supply cord from wall |
very |
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| wire reversed in junction box. |
| socket. Open junction box and |
rapid |
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| switch the hot and neutral wires. |
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Page 18
