Smith Cast Iron Boilers GT Series manual Trouble Shooting, Burner shuts off, Before set-point

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.