Smith Cast Iron Boilers GT Series Sentry Controller, Locks-up, Display Goes Blank, or pulsates

	GT INSTALLATION AND OPERATION INSTRUCTIONS		Page 39
Problem	Detected Problem	Solution
Sentry Controller	Excessive noise, current, or voltage spikes	Check for voltage at the wires going to the
Locks-up	in the 120V power supply.	A-C-T terminals of the Boiler.
		Check the magnitude of the line voltage
		power supply.
		Check the Amp draw of output C1 and Ap
		(max 3 Amp).
		Check the Amp draw of control on start-up
		(max 6 Amps)
		Contact Smith.
Display Goes Blank	No power to control or control failure.	Check for 120V between terminals L1 and
		L2 at Sentry.
		If 120V exists turn power off and remove
		line voltage harness from Sentry. Then
		check for resistance between L1 and L2
		of control, if the circuit is open (O.L) the
		internal fuse has blown. Check for shorts
		in wires leading to circulators prior to
		replacing controller.
		If 120V not present, check wiring and for
		120V at source.
Boiler Lights rough	Typically an imbalance in the air to gas	Ensure that the venting lengths are in
or pulsates	ratio.	compliance with the venting sections
		above.
		Ensure that the line pressure during
		operation does not drop more than 20%
		from the static line pressure.
		Momentarily remove the intake vent from
		the boiler during ignition, if unit lights
		smoothly with intake vent disconnected
		reconnect and check for proper
		combustion if unit maintains smooth
		operation after ignition. Calibrate for
		proper combustion. If problem persists
		contact Smith.
Fan appears to be	Slight vibration can cause noise in the	Use flexible gas line to insolate the
creating a noise in	residence. This is not a warranty issue.	vibration noises between the gas valve
the housing		and the line.
		Don’t hang gas lines from floor joists.
		Use rubber insulators with gas line
		supports.
	Making a rubbing noise. This is not a	If gas valve is not held when the gas
	warranty issue.	nipple is connected, the force of tightening
		the fitting can damage the valve, and warp
		the fan housing.
		If pipe is used, the gas line must not
		create any forces to the valve, either
		vertically (weight of line), or horizontally
		(misaligned connection)