LAARS HWG-M2-250 - Installation, Operation and Maintenance Instructions - Manual (Page 17)

9600 HWG Water Heater Page 17
6.2 9600 Overheats Quickly or Knocks
During Operation
Boiling noise in combustion chamber.
1. Air in combustion coil or in pump: Purge
system.
2. Pump failure or control failure.
3. 9600 HWG lime buildup in primary heat
exchanger.
4. Restriction in storage tank piping.
5. Defective thermostatic valve element.
6.3 Delayed Ignition
Unit starts or stops with a “pop”.
1. Wrong gas orifice for fuel or air orifice size.
2. LP-Gas regulator lock up 3" or greater above run
pressure: correct regulator and check gas pipe
sizing against piping chart in installation manual.
Set regulator for maximum run pressure of 9".
3. Remove blower and inspect flame holder
(burner) for hole.
4. Check that the blower flanges and gas piping are
sealed.
6.4 Occasional Lockouts
Requires interruption of power or reset of
safety limit to re-start.
1. Air in system causes safety limit to open. Vent
air from system and eliminate source of air.
2. Condensing in primary heat exchanger or
moisture in combustion chamber.
a.) defective element in thermostatic valve.
b.) improper installation of intake terminal.
c.) blocked condensate and condensate
overflow system.
3. Poor Combustion - check CO2 or O2.
4. Intermittent ignitor failure: defective ignitor
gasket allows ignitor base to overheat.
5. Occasional failure of blower: red “PURGE” light
will be flashing.