American Water Heater 318281-000 Problem, Check This, Possible Cause, Corrective Action

PROBLEM	CHECK THIS	POSSIBLE CAUSE	CORRECTIVE ACTION
Pump does not start	Electrical power supply	Controller plug disconnected	Reconnect control plug to
			power outlet
		Blown fuse or breaker tripped	Determine cause and replace
		on overload	fuse or reset breaker
	Pump	Motor failure	Replace pump
	Sensors	Defective sensors, sensor	Check wiring continuity.
		error	Repair or replace
Pump starts, but cycles	Differential controller	On and/or off temperature	Reset on and off
continuously		differential set points too low	differentials according to
			recommendations
	Piping	Reversed connections to	Compare with system
		collectors	schematic and reconnect
			properly
	Sensors	Improper location	Compare with system
			schematic and reconnect
			properly
Pump cycles after dark	Differential controller	Recooling function active	Controller operating properly.
		and max temperature setting	No fault.
		exceeded
	Sensors	Defective sensors, sensor	Check wiring continuity.
		error	Repair or replace
Pump runs continuously	Differential controller	Off temperature differential set	Reset off differential according
		too low	to recommendation
		Controller set to “on” position	Set system operation to
			“Auto”
Pump operated but no fluid	Airstop	System air-locked	Purge air from airstop in solar
flows from collectors			pump station by opening valve
			slowly. Caution: after air is
			evacuated fluid will flow out
			in a small stream and may be
			hot. Cover port with a rag to
			catch any fluid.
	Air vent	System air-locked	Open air vent on the top of the
			system and purge excess air.
			Close after purging.
	Fluid	Loss of fluid from system	Locate leak and repair
	Isolation valves	Valves in closed position	Open valves
	Piping	Clogged or damaged piping	Unblock piping or repair
			damaged piping
	Pump	Broken impeller shaft	Replace shaft
		Not vented properly	Install in correct orientation
		Undersized	System piping run too long.
			Refer to maximum piping
			lengths and adjust
Noisy system	Air vents	Air trapped in system	Open automatic air vent and
			purge airstop in solar pump
			station by opening the valve
			slowly. Caution: after air is
			evacuated fluid will flow out
			in a small stream and may be
			hot. Cover port with a rag to
			catch any fluid.
	Pump	Bearings are dry or have	Lubricate or replace
		excessive wear
		Impeller loose	Tighten or replace impeller

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