Page 36

GT INSTALLATION AND OPERATION INSTRUCTIONS

TROUBLE SHOOTING

This section is intended to assist the service technician in detecting and correcting common errors. The Sentry 2100 is equipped with an internal diagnostic system that verifies control operation. The following series of error codes has been developed to aid in diagnosing control problems:

Problem

Detected Problem

 

Solution

 

 

 

 

ER1 On Display

The Safety High Limit of 215°F, 102°C,

1.

Check to see if water is dripping on the

 

has been reached.

 

sensor.

 

 

2.

Reduce the Hi setting (and/or) ensure

 

 

 

that there is proper water circulation in

 

 

 

the system.

 

 

 

ER2 On Display

Water Probe... The water probe is

Check wiring

 

transmitting an invalid signal - closed

 

 

 

circuit.

 

 

 

 

 

ER3 On Display

Water probe...Sentry is sensing an open

Check wiring. (Note: ER3 will be

 

circuit at water probe. Or, the wiring to the

displayed if temperature sensed is

 

outdoor probe is grounded.

less then 32°F, 0°C.)

 

 

Note: If problem is corrected by resetting

 

 

power, Sentry control had locked-up;

 

 

contact Smith.

 

 

 

 

ER5 On Display

The control has determined an Indirect

1.

Not enough flow to keep boiler from

DHW Problem

water heater problem; the boiler has

 

tripping on limit. Verify that a min. of

 

cycled off 10 times during a single call

 

6 GPM, 0.4 L/s, flow is going through

 

for domestic. The Indirect call will now be

 

boiler & indirect circuit.

 

ignored until power is reset or the indirect

2.

Reduce indirect Aquastat setting,

 

call is interrupted.

 

or Increase difference between (Lo

 

 

 

Setting) and (indirect Aquastat setting).

 

 

3. Indirect limit or wiring failure.

 

 

 

 

ER6

“Flame Lock Out”

1.

There is a problem in the ignition

 

Sentry has sensed a lack of 24V to the

 

sequence; it could be caused by a

 

gas valve during operation or a Fenwal

 

faulty igniter, flame sensor, gas valve or

 

ignition lockout.

 

improper line pressure or combustion.

 

 

 

Check ignition sequence to determine

 

 

 

which component is not functioning.

 

 

 

(Sentry will retry ignition sequence

 

 

 

1 hour after ER6 code originally

 

 

 

occurs or if control is reset)

 

 

2. Check for 24V between B on terminal

 

 

 

block and F1 on Sentry plug, if not

 

 

 

present a limit has tripped (see wiring

 

 

 

diagram).

 

 

3.

the Flow Switch on the GT-400 is also

 

 

 

in the 24V circuit. Check for proper

 

 

 

water flow and flow switch operation.

 

 

 

Burner shuts off

Reset calculation being used to

If OD probe is being used, the HI setting will

before set-point

lower HI setting.

be calculated using formula in Section 8.

temperature is

 

 

 

 

 

 

reached (and burner

Thermostat is satisfied

1.

If the thermostat demand light is

light goes out)

 

 

turning off, the thermostat has satisfied.

 

 

2.

If DHW temp light is turning off; the

 

 

 

aquastat or call for domestic has been

 

 

 

satisfied.

 

 

 

 

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Image 36
Smith Cast Iron Boilers GT Series manual Trouble Shooting, Burner shuts off, Before set-point, Temperature is
Page 35 Page 37

GT Series specifications

Smith Cast Iron Boilers GT Series has become a benchmark in the hydronic heating industry, renowned for its exceptional performance, durability, and efficiency. This series is designed to cater to diverse heating needs, making it a popular choice among both residential and commercial applications.

One of the standout features of the GT Series is its robust cast iron construction. The cast iron sections offer superior thermal mass, allowing for better heat retention and distribution. This characteristic ensures that the boiler operates efficiently, maintaining comfortable temperatures even during extreme cold weather conditions. The engineers at Smith have meticulously designed each section to provide maximum strength and longevity, resulting in a boiler that can withstand the test of time.

The GT Series also incorporates advanced combustion technology. It utilizes a high-efficiency burner that optimizes fuel consumption, resulting in lower operating costs for homeowners and businesses alike. The boiler is engineered to accommodate a variety of fuel types, including natural gas and propane, giving users flexibility in their energy choices. This adaptability not only enhances efficiency but also promotes environmental sustainability by allowing for the use of cleaner fuel sources.

Another notable technology featured in the GT Series is the electronic control system. This system simplifies boiler operation and enhances user convenience. The intuitive interface provides real-time feedback and diagnostics, making it easier for technicians to perform maintenance and troubleshoot any issues that may arise. Additionally, the boiler’s modulating operation adjusts the burner output according to the heating demand, further improving efficiency and comfort.

Moreover, the GT Series is designed with user-friendly installation in mind. Its compact footprint allows for easy integration into existing heating systems, minimizing space requirements. Additionally, the boiler is equipped with convenient access points for maintenance, ensuring that servicing is straightforward and can be performed without extensive downtime.

Lastly, the Smith Cast Iron Boilers GT Series is designed to meet stringent safety and performance standards. Featuring multiple safety controls and systems, it provides peace of mind for users. With a commitment to quality, efficiency, and performance, the GT Series stands out as a leading solution for hydronic heating, catering to the evolving needs of today’s energy-conscious consumers.
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