13 Fault Finding
Before detailed checking of electrical components ensure that remote controls are calling for | ||||
heat. Check that the gas supply is free of obstructions and purged of air. Check the overheat | ||||
thermostat and fluehood thermostat have not operated. Isolate the electrical supply and | ||||
physically check ALL cables, connections and the printed circuit board (PCB) fuse. Check | ||||
| the air tubes to air pressure switch. |
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Is there 240V | NO | Correct power |
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between L + N |
| supply problem |
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YES |
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Is thermostat | NO |
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| Isolate supply |
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neon on ? |
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YES |
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Isolate supply |
| Check continuity | NO | Replace |
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| of overheat |
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| overheat | |
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| thermostat. |
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| thermostat | |
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| Thermostat ok ? |
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| YES |
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| Check continuity of | NO |
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| control thermostat | Replace control | |
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| between 3 and 6 |
| thermostat |
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| ok ? |
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| YES |
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| Check wiring |
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| and IC PCB |
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| 'stat' plug for |
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| defects. |
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| Repair or |
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| replace wiring/ |
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| PCB if |
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| necessary |
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Is there | NO |
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continuity |
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between NC |
| Replace APS |
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and |
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C on APS |
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YES |
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1 |
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PM5 |
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| Diagram 13.1 |
221834B |
| 28 |
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