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Gas Valve / Relay Failure 1 • Check wiring harness connection at the gas valve and (will require a manual at the main control board. reset once the condition has been corrected. Press The main control board did not detect gas valve 1. • Replace the gas valve wire harness. the RESET button on the • Replace the gas valve. SMART TOUCH display to reset.) Gas Valve / Relay Failure 2 • Check wiring harness connection at the gas valve and (will require a manual at the main control board. reset once the condition has been corrected. Press The main control board did not detect gas valve 2. • Replace the gas valve wire harness. the RESET button on the • Replace the gas valve. SMART TOUCH display to reset.) Service Manual 3 Troubleshooting Table 3G (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION Auto Reset High Limit The outlet water temperature has exceeded the setting of the automatic reset high limit. • Verify that the system is full of water and that all air has been properly purged from the system. • Verify that the boiler is piped properly into the heating system. Refer to Section 5 - Hydronic Piping of the Crest Installation and Operation Manual for the proper piping methods for the Crest boiler. • Check 120 vac to boiler pump motor on a call for heat. If voltage is not present, check wiring back to the main control board. • Check the ARHL set point. • If 120 vac is present on a call for heat and the boiler pump is not operating, replace the pump. • If the system pump is a variable speed pump, ensure that the system flow is not less than the boiler flow. • If operating on something other than an outlet sensor, check temperature setting of the main control board. • If the optional manual reset high limit has tripped, check setting of the device. • Check resistance of water sensors and compare to Table 3B on page 38 of this manual. Replace sensor if necessary. • Replace the main control board. Manual Reset High Limit Open (will require a manual reset once the condition has been corrected. Press The outlet water temperature has exceeded the setting of the high limit. • Verify that the system is full of water and that all air has been properly purged from the system. • Verify that the boiler is piped properly into the heating system. Refer to Section 5 - Hydronic Piping of the Crest Installation and Operation Manual for the proper piping methods for the Crest boiler. • Check voltage to boiler pump motor on a call for heat. If voltage is not present, check wiring back to the main control board. • Replace the pump relay if necessary. • If 120 vac is present on a call for heat and the boiler pump is not operating, replace the pump. • If the system pump is a variable speed pump, ensure the RESET button on the SMART TOUCH display to reset.) that the system flow is not less than the boiler flow. • If operating on either an inlet or system supply sensor, check temperature setting of the main control board. • If the high limit has tripped, check setting of the device and the MRHL set point. • Check resistance of water sensors and compare to Table 3B on page 38 of this manual. Replace sensor if necessary. • Replace high limit (if equipped). • Replace main control board. Service Manual 3 Troubleshooting (continued) Table 3G (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface FAULT DESCRIPTION CORRECTIVE ACTION Fan Speed Low 1 (will require a manual reset once the condition has been corrected. Press the RESET button on the SMART TOUCH display to reset.) The actual fan 1 RPM is 30% lower than what is being called for. • Vent/air intake lengths exceed the maximum allowed lengths. Refer to Section 2 - General Venting of the Crest Installation and Operation Manual for proper lengths. • Check for obstruction or blockage in the vent/air intake pipes or at terminations. • Check the wiring connections at fan 1 and at the main control board. • Replace the fan. Blown fuse. • Replace fuse F2 on the control board, see page 36 of this manual. Fan Speed Low 2 (will require a manual reset once the condition has been corrected. Press the RESET button on the SMART TOUCH display to reset.) The actual fan 2 RPM is 30% lower than what is being called for. • Vent/air intake lengths exceed the maximum allowed lengths. Refer to Section 2 - General Venting of the Crest Installation and Operation Manual for proper lengths. • Check for obstruction or blockage in the vent/air intake pipes or at terminations. • Check the wiring connections at fan 2 and at the main control board. • Replace the fan. Blown fuse. • Replace fuse F2 on the control board, see page 36 of this manual. Fan Speed High 1 (will require a manual reset once the condition has been corrected. Press the RESET button on the SMART TOUCH display to reset.) The actual fan 1 RPM is 30% higher than what is being called for. • Vent/air intake lengths exceed the...

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