installation & maintenance manual maxim 3 - Pvi.com

MAXIM 3 ® WATER HEATER
13 TROUBLESHOOTING GUIDE
Problem Probable Cause Corrective Action
Starting or Pre-purge
Failure
Flame Failure
Power Supply
On-Off Switch
Temperature Control
Flame Safeguard Control
Remote enable/disable open
Combustion Air blower
Air-proving Switch
Blocked Filter Switch
Flame Control Pressure Switch
Loose Wire Connections
Power Supply
Flame Safeguard Control
Hot Surface Igniter
Air-proving Switch
Gas Pressure
Combustion
Grounding
Safety Limits
Check fuse and/or circuit breaker. Check voltage at
120/24V step-down transformer.
Check if On-Off switch is lighted
Check that the operating temperature control is set
higher than the temperature of the water heater.
Check for bad ground or bad control. Replace if
necessary.
Enable water heater or place jumper between
terminals R1-R2.
Check if fan connection terminals on flame control
is closed
Check for 24V at field access terminal C2. Remote
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
Check for 24V at the common side of air switch
Check for proper blower pressure setting – adjust if
required. Air switch may be defective.
Check for 24V at the N.C. side of the blocked filter
switch. Replace filter or switch as required.
Check for 24V at the pressure switch terminal.
Check connections to all components
Check fuse and/or circuit breaker. Check voltage at
120/24V step-down transformer.
Check for bad ground or bad control. Replace if
necessary.
Check resistance at room temperature and then the
amperage draw during heat-up. Replace if the
measured amperage is not within 3.5 to 5.0 Amps
or if measured resistance is not within 40-100 ohms
(at room temperature). Also, check for overheating
condition due to damaged refractory around igniter.
Check if switch is bouncing. Adjust or replace.
Check for proper inlet static and dynamic gas
pressure.
Inadequate flame signal may result from improper
combustion. Adjust to proper CO2 levels at low fire.
Check for proper ground from flame control to
burner housing.
Check all safety limits for fault condition and correct
as required.
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PV500-51 03/14