PVI Industries PV500-44U manual Troubleshooting Guide, Problem, Probable Cause, Corrective Action

15 TROUBLESHOOTING GUIDE

Problem	Probable Cause	Corrective Action
	Power Supply	Check fuse and/or circuit breaker. Check voltage at
		120/24V step-down transformer.
	On-Off Switch	Check if On-Off switch is lighted.
	Temperature Control	Check that the operating temperature control is set
		higher than the temperature of the water heater.
	Flame Safeguard Control	Check for bad ground or bad control. Replace if
		necessary.
	Remote enable/disable open	Enable water heater or place jumper between
		terminals R1-R2.
		Check if fan connection terminals on flame control
		is closed.
Starting or Pre-purge	Combustion Air blower	Check for 24V at field access terminal C2. Remote
Failure		interlock may be open.
		Fan VFD may be defective. Verify proper voltage.
		Check switch contacts are closed.
		Check for 24V at the N.O. side of air switch.
	Air-proving Switch	Check for 24V at the common side of air switch.
		Check for proper blower pressure setting – adjust if
		required. Air switch may be defective.
	Blocked Filter Switch	Check for 24V at the N.C. side of the blocked filter
	(if equipped)	switch. Replace filter or switch as required.
	Flame Control Pressure Switch	Check for 24V at the pressure switch terminal.
	Loose Wire Connections	Check connections to all components.
	Power Supply	Check fuse and/or circuit breaker. Check voltage at
		120/24V step-down transformer.
	Flame Safeguard Control	Check for bad ground or bad control. Replace if
		necessary.
		Check amp draw during heat-up. Replace if amps
	Hot Surface Igniter	greater than 3.1A. Check for overheating condition
		due to damaged refractory around igniter.
Flame Failure	Air-proving Switch	Check if switch is bouncing. Adjust or replace.
	Gas Pressure	Check for proper inlet static and dynamic gas
		pressure.
	Combustion	Inadequate flame signal may result from improper
		combustion. Adjust to proper CO2 levels at low fire.
	Grounding	Check for proper ground from flame control to
		burner housing.
	Safety Limits	Check all safety limits for fault condition and correct
		as required.

33

PV500-44U 06/12