Troubleshooting & Service | 28 |
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LEGEND OF FAULT ICONS AND TYPE OF PROBLEMS FLAGGED
This fault icon displays whenever there is an unexpected loss of flame. This condition may arise from air in gas supply line or malfunction of flame detection circuit or related hardware. This is a hard lockout condition requiring a manual reset to clear.
This fault icon displays whenever one or more of safety temperature limit switches open to flag an excessive temperature condition. This is a soft lockout condition and if the condition clears the fault icon will clear and normal operation of heater will proceed.
This fault icon displays whenever the thermal fuse has opened due to a flame
This fault icon displays whenever there is a failure of either the low gas pressure switch (due to low pressure or switch failure) or additionally the fan and/or air pressure switch circuit has failed resulting in an open safety circuit. The nature of these faults are mission critical for the safe operation of the heater and result in a hard lockout. The cause of the fault must be corrected and the heater will require a manual reset by toggling the power supplied to the 7800 Controller to clear the fault.
This fault icon displays whenever insufficient waterflow causes the water pressure switch to fail to close. This is a soft lockout condition and will clear by itself if the waterflow is restored. The icon will then clear and if the heater was attempting to fire the cycle will restart and continue.
P/N 472032 | Rev. A |
