VII. Trouble Shooting
PROBLEM | CAUSE | SOLUTION |
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No hot water at faucet | Boiler does not operate | Refer to boiler installation instructions |
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| Check main service switch |
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| Check fused disconnect |
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| Circulator does not operate | Check power supply |
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| Check shaft coupling |
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| Improper aquastat setting or calibration | Turn tank aquastat to higher setting |
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| Zone valve does not open (if used) | Check power supply |
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| Electrical problem (relay, wiring, fuse, etc. ) | Check fuse and replace |
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| Check circuit breaker and reset (if applicable) |
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| Check power supply |
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| Scale | If boiler, circulator and tank are operating satisfactorily, coil |
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| may have scale coating. See Section VI: Service Instructions |
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| Clogged cold water filter or boiler supply | Clean or replace filter or strainer |
| strainer (if used) |
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Insufficient hot water | Aquastat setting too low | Adjust aquastat to higher setting |
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| Undersized boiler with no priority to | Rewire for priority |
| domestic hot water |
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| Peak use of hot water is greater than tank | Determine peak usage and compare to tank volume |
| storage capacity |
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| Scale | If boiler, circulator and tank are operating satisfactorily, coil |
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| may have scale coating. See Section VI: Service Instructions |
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| Faulty tank aquastat | Replace aquastat |
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Water at faucet too hot | Aquastat set too high | Lower aquastat setting |
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| Improper system plumbing | Compare plumbing to Section III: Piping |
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| Improper system wiring | Compare wiring to Section IV: Electrical |
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Boiler cycles more | Excessive demand | Reduce demand or consider larger tank |
than 5 times per |
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day in summer | Faulty aquastat | Replace aquastat |
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| Boiler high limit set too low | Increase boiler high limit setting |
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| Scale | If boiler, circulator and tank are operating satisfactorily, coil |
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| may have scale coating. See Section VI: Service Instructions |
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