Auto Reset, Manual Reset, High Limit Open

Service Manual

3 Troubleshooting

Table 3G (continued from previous page) Troubleshooting Chart - Fault Messages Displayed on Boiler Interface

FAULT	DESCRIPTION		CORRECTIVE ACTION

		• 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.
Auto Reset	The outlet water temperature has exceeded	• If 120 vac is present on a call for heat and the boiler
Auto Reset	the setting of the automatic reset high limit.	pump is not operating, replace the pump.
High Limit	the setting of the automatic reset high limit.
High Limit		• If the system pump is a variable speed pump, ensure
		• 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.

		• 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
Manual Reset		the main control board.
Manual Reset		• Replace the pump relay if necessary.
High Limit Open		• If 120 vac is present on a call for heat and the boiler
(will require a manual	The outlet water temperature has exceeded	• If 120 vac is present on a call for heat and the boiler
(will require a manual		pump is not operating, replace the pump.
reset once the condition		pump is not operating, replace the pump.
reset once the condition	the setting of the high limit.	• If the system pump is a variable speed pump, ensure
has been corrected. Press	the setting of the high limit.	• If the system pump is a variable speed pump, ensure
the RESET button on the		that the system flow is not less than the boiler flow.
SMART TOUCH display		• If operating on either an inlet or system supply sensor,
to reset.)		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.

3, 2, 3.5, 2.5, 1.5 specifications

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In terms of design, Lochinvar's models are constructed with durable materials, ensuring longevity and reliability in demanding environments. The stainless steel heat exchanger is a key element that contributes to the durability and performance of the units. This material is resistant to corrosion and scale build-up, enhancing the lifespan of the heater and reducing maintenance requirements.

The Lochinvar 1.5, 1.3, and 1.0 models feature advanced control systems that provide precise temperature management and easy operation. The intuitive digital display allows users to monitor performance metrics, temperature settings, and energy consumption with ease. Additionally, these units are equipped with intelligent modulating gas valves that optimize fuel usage based on demand, ensuring efficient operation across various load conditions.

Safety is a priority in the design of Lochinvar's water heaters. The models come with built-in safety features, including flame failure detection, overheat protection, and venting safeguards. These systems work together to ensure the safe operation of the units, giving users peace of mind.

Another characteristic that makes the Lochinvar 1.5, 1.3, and 1.0 models popular among users is their compact design. These units are engineered to fit in tight spaces, making them ideal for installations where space is at a premium. Despite their small footprint, they deliver powerful performance, ensuring that users have access to the hot water they need.

In summary, Lochinvar's 1.5, 1.3, and 1.0 water heating models represent the pinnacle of efficiency, safety, and reliability. With their advanced technologies, durable construction, and user-friendly features, these units are an excellent choice for anyone seeking a high-performance water heating solution.

3 Troubleshooting

FAULT

Auto Reset

High Limit

Manual Reset

High Limit Open

3, 2, 3.5, 2.5, 1.5 specifications