Flow Switch, Flame, Sequence, GV/Relay, Fail

Service Manual

3Troubleshooting (continued)

Table 3E Troubleshooting Chart - Fault Messages Displayed on Water Heater Interface

FAULT	DESCRIPTION	CORRECTIVE ACTION

	Either the manual reset low gas pressure	• Reset the pressure switches.
		• Reset the pressure switches.
	switch or the manual reset high gas pressure
Gas Pressure SW	switch tripped.	• Measure the supply gas pressure to determine cause
Gas Pressure SW		of failure. Natural gas pressures should be between
(will require a manual		4 - 14 inches w.c.
reset once the condition		• Refer to Section 7 - Gas Connections of the Armor
has been corrected.		• Refer to Section 7 - Gas Connections of the Armor
has been corrected.		Water Heater Installation and Operation Manual for
Press the RESET button		Water Heater Installation and Operation Manual for
Press the RESET button		detailed information concerning the gas supply.
on the SMART SYSTEM		detailed information concerning the gas supply.
on the SMART SYSTEM
display to reset.)		• Correct the supply gas pressure if necessary.
		• Check for a loose or misplaced jumper if pressure
		switches are not installed.

	The flow switch is not making.	• Check water heater pump operation on a call for heat.
		• Check water heater pump operation on a call for heat.
Flow Switch		• Check for closed valves or obstructions in the water
Flow Switch		heater piping.
(will require a manual		• Verify system is full of water and all air has been
reset once condition has		• Verify system is full of water and all air has been
reset once condition has		purged from the system.
been corrected. Press		purged from the system.
been corrected. Press
the RESET button on		• Check for loose or misplaced jumpers if flow switch is
the SMART SYSTEM		• Check for loose or misplaced jumpers if flow switch is
the SMART SYSTEM		not installed.
display to reset.)		not installed.

	Blown fuse.	• Replace fuse F2 on the control board, see page 21 of
	Blown fuse.	• Replace fuse F2 on the control board, see page 21 of
		this manual.

Blocked Drain SW	The blocked drain switch has detected	• Check condensate tube from unit to floor drain for
Blocked Drain SW	excessive condensate build up inside the	proper installation and obstructions.
(will require a manual	unit.	• Inspect condensate trap for blockage.	Clean if
reset once condition has		• Inspect condensate trap for blockage.	Clean if
reset once condition has		necessary.
been corrected. Press		necessary.
been corrected. Press
the RESET button on		• Check for loose wiring connection at wire	harness
the SMART SYSTEM		• Check for loose wiring connection at wire	harness
the SMART SYSTEM		plug.
display to reset.)		plug.
display to reset.)
		• Bad blocked drain switch. Replace switch.
Flame	The flame detector circuit is seeing a flame	• Check supply voltage for proper polarity.
Sequence	signal while no flame is present.
Sequence		• Check external wiring for voltage feedback.
(will require a manual		• Check external wiring for voltage feedback.
(will require a manual
reset once the condition		• Check the flame rod and make sure it is clean.
has been corrected.		• Check the internal wiring for bad connections.
Press the RESET button		• Check the internal wiring for bad connections.
on the SMART SYSTEM		• Replace main control board.
display to reset.)		• Replace main control board.
display to reset.)
GV/Relay	The main control board did not detect the gas	• Check wiring harness connection at the gas valve and
Fail	valve.	at the main control board.
		at the main control board.

(will require a manual		• Replace the gas valve wire harness.
reset once the condition		• Replace the gas valve wire harness.
reset once the condition
has been corrected.		• Replace the gas valve.
Press the RESET button		• Replace the main control board.
on the SMART SYSTEM		• Replace the main control board.
display to reset.)

			25

150 - 500 specifications

Lochinvar has established itself as a leader in the field of hydronic heating solutions, and the Lochinvar 150 - 500 series is a prime example of its commitment to innovation and efficiency. Designed primarily for commercial applications, this line of high-efficiency boilers is engineered to provide optimized performance, reliability, and cost-effectiveness.

One of the standout features of the Lochinvar 150 - 500 series is its robust construction. Built with a durable stainless-steel heat exchanger, these boilers offer superior resistance to corrosion, ensuring a longer lifespan and consistent performance over time. The advanced design of the heat exchanger also maximizes heat transfer, contributing to higher efficiency ratings.

In terms of technology, the Lochinvar 150 - 500 series incorporates the Concentric Venting System, which allows for flexible installation options and reduces the overall footprint required for the boiler setup. This system is particularly advantageous in commercial settings where space can be limited. The boilers are equipped with smart controls that provide real-time monitoring and diagnostics, allowing for easier maintenance and reducing downtime.

The series features a comprehensive modulation range, allowing the boilers to adjust their output based on the heating demand. This capability not only enhances efficiency but also lowers energy consumption, making it an eco-friendly choice for businesses seeking to reduce their environmental impact. The Lochinvar 150 - 500 boilers utilize innovative combustion technologies, including an integrated burner that ensures optimal combustion efficiency and reduced emissions.

Safety is a priority with the Lochinvar 150 - 500 series, which includes multiple safety features such as lockout protection, pressure switches, and high-temperature limit controls. These measures ensure that the unit operates safely under varying conditions, providing peace of mind for operators.

Additionally, the compact design of the Lochinvar 150 - 500 series allows for easy transportation and installation. Its lightweight structure enables it to be maneuvered through tight spaces typically found in commercial buildings, making it a versatile option for installers.

In summary, the Lochinvar 150 - 500 series is an excellent choice for anyone seeking a reliable, efficient, and technologically advanced boiler solution. With its durable construction, advanced features, and commitment to safety and efficiency, this series stands out as a trusted option in the competitive market of hydronic heating systems.

Lochinvar 150 - 500 service manual Flow Switch, Flame, Sequence, GV/Relay, Fail

Models: 150 - 500

3Troubleshooting (continued)

FAULT

DESCRIPTION

CORRECTIVE ACTION

Gas Pressure SW

Flow Switch

Blocked Drain SW

Flame

Sequence

GV/Relay

Fail

150 - 500 specifications