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

PROBLEM	CHECK THIS	POSSIBLE CAUSE	CORRECTIVE ACTION
Not enough hot water (cont.)	Differential Controller	Improper wiring or loose	Compare with system
		connections)	schematic. Check for proper
			connections. Seal all splices
			against moisture
	Isolation valves	Closed	Open
	Thermostatic mixing valve	Improper adjustment	Check water temperature at
			house faucet and adjust valve
			setting
		Valve defective	Replace. System must not
			be run without thermostatic
			mixing valve due to scald risk.
	Piping	Insufficient Insulation	Add insulation where required
		High heat losses	Check insulation for splits,
			deterioration, absence
		Nighttime thermosyphoning	Check for pump operation at
			night
		Improperly plumbed	Compare with system
			schematic. Check flow
			direction
		Flow blockage	Flush system. Check effluent
			for debris.
		Low system pressure	Check pressure gauge. Set
			system pressure to correct
			setting, check for leaks.
	Pump	No power	Check breaker, pump cord,
			and controller fuse. Repair or
			replace
		Flow rated too high or too low	Adjust flow rate
		Faulty pump	Listen for irregular noises
			in pump operation. Feel
			collector feed and return line
			for temperature difference.
			Ensure all air is purged from
			system.
		Runs continuously	Check sensors for shorts
No hot water in the morning	Storage water heater	Circuit breaker shut off	Turn breaker on
	Differential controller	Sensor wires reversed	Ensure the collector and
			tanks sensors are wired to
			the correct position on the
			controller
Water too hot	Thermostatic mixing valve	Improper adjustment	Check water temperature at
			house faucet and adjust valve
			setting
		Valve defective	Replace. System must not
			be run without thermostatic
			mixing valve due to scald risk.
No water	Cold-water supply valve	Valve closed	Open valve
Pump does not start	Differential controller	Controller set to “off” position	Set system operation to
			“Auto”
		Uplugged	Return power to controller
		On and/or off temperature	Reset on and off
		differential set points too high	differentials according to
			recommendations
		Loose contacts	Clean contacts and tighten
			connections or replace
		Blown fuse	Replace fuse

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