Univex 318258-000 Troubleshooting Chart, Problem, Possible Causes, Corrective Action, sensor

TROUBLESHOOTING CHART

PROBLEM		POSSIBLE CAUSE(S)		CORRECTIVE ACTION
NO HOT WATER	1.	Hot water usage pattern exceeds the	1.	Change to different mode or modify usage
		capability of the water heater in		patterns
	2.	current mode	2.	Check for blown fuse or tripped breaker.
		No power to the water heater
	3.	Unit in standby	3.	Restore power to unit then press power button.
				Press the power button to turn the unit on
	4.	Unit in Vacation mode	4.	Select mode other than Vacation
	5.	High temperature limit switch open	5.	Reset the high temperature limit switch; see
	6.	Non-functioning upper temperature	6.	“Safety shut-off” section for more information
				Contact a qualified person for service
		sensor
INSUFFICIENT HOT WATER/	1.	Temperature set-point too low	1.	Increase set point temperature; see “Adjusting
SLOW HOT WATER	2.	Air filter dirty		the User Interface Module” section
RECOVERY			2.	Clean air filter
	3.	Hot water usage pattern exceeds the	3.	Change to different mode or modify usage
		capability of the water heater in		patterns (For example if in Efficiency Mode
	4.	current mode	4.	switch to Hybrid Mode)
		Water connections to unit reversed		Ensure the cold connection is at the bottom
	5.	Heat lost through long run of exposed	5.	and that the hot connection is at the top
				Insulate exposed piping
	6.	pipe	6.	Repair hot water leaks
		Hot water leak at faucet or piping
	7.	Non-functioning heating element	7.	Call qualified person for service
	8.	Sediment or scale build up in tank	8.	Drain and flush tank. Water conditioning may
				be necessary to minimize build up
HIGH OPERATION COSTS	1.	Temperature set-point too high	1.	Decrease set point temperature; see “Adjusting
	2.	Air filter dirty	2.	the User Interface Module”
				Clean air filter
	3.	Electric mode selected	3.	Change to Efficiency or Hybrid mode for re-
	4.	Water connections to unit reversed	4.	duced energy costs
				Ensure the cold connection is at the bottom
	5.	Heat lost thru long run of exposed	5.	and that the hot connection is at the top
				Insulate exposed piping
	6.	pipe	6.	Repair hot water leaks
		Hot water leak at faucet or piping
	7.	Sediment or scale build up in tank	7.	Drain and flush tank. Water conditioning may
				be required to minimze build up
DRIP FROM TEMPERATURE &	1.	Excessive water pressure	1.	Check water supply inlet pressure. If higher
PRESSURE RELIEF VALVE				than 80 PSIG, install a pressure reducing
(Warning: Do not plug or cap				valve
T&P discharge pipe.)	2.	Add or service a thermal expansion	2.	See “Closed System/Thermal Expansion” section
	3.	tank.	3.	Replace the Temperature & PressureRelief
		Non-functioning Temperature &
		Pressure Relief Valve		Valve
OTHER	1.	The water heater does not	1.	When first started the water heater takes about 8
	2.	immediately start	2.	minutes to complete a diagnostic routine
		The heat pump does not run in		Contact a qualified person for service
	3.	Efficiency mode.	3.	Contact a qualified person for service
		The heat pump runs when set to
		Electric mode.

17