Lochinvar CG200 User Manual

26

This checklist in conjunction with “TROUBLESHOOTING” and the “SEQUENCE OF OPERATION” should be used as an on-the-job 

troubleshooting guide to identify the cause of incorrect system operation and suggest a remedy for its correction. Because improper 

piping and wiring can result in unsatisfactory system performance, it is suggested that the installation be examined before using the 

checklist.  Be sure to refer to the correct piping and wiring diagram for the type of system that is installed.

The system should be filled with water, purged of air, valves properly set and utilities connected and ready to operate.

   

 

                                                   

*Water not hot enough. 

Thermostat set too low. 

Set thermostat dial to a higher

  

 

temperature.

   

Thermostat out of calibration. 

Call serviceman 

Recalibrate thermostat. If thermostat cannot

   

 

 

be recalibrated, replace.

*Insufficient hot water 

Thermostat set too low. 

Set thermostat dial to a higher

*See WATER TEMPERATURE   

temperature.

CONTROL WARNING (on 

Page 20). 

Thermostat out of calibration. 

Call serviceman. 

Recalibrate thermostat. If thermostat cannot

   

 

 

be recalibrated, replace.

   

Main manual gas shutoff 

Open main manual gas shutoff 

   

valve partially closed. 

valve to fullest extent. 

 

   

Heater too small for demand. 

Space usage to give heater time

   

 

to restore water temperature. 

 

   

Thermostat differential is 

Call serviceman. 

Replace dual bulb controller if differential is

   

too wide. 

 

greater than 4°F.

   

Heater recovery is slower. 

Call serviceman. 

Check gas input. If incorrect, adjust gas

   

 

 

pressure or replace main burner orifice.

   

Drafthood not installed or 

Call serviceman. 

Install drafthood or baffles as furnished 

   

one or more flue baffles. 

 

with unit.

Water temperature too hot. 

Thermostat set too high. 

Set thermostat to a lower setting. 

Heater makes sounds: sizzling.  Condensation on outside

   

of tank, normal. 

 

 

Rumbling. 

Sediment accumulation on 

Drain a quantity of water through 

Delime heater.

   

bottom of tank. 

drain valve. If rumbling persists,

   

 

call a serviceman.

Ticking or metallic sounds. 

Expansion and contraction- 

   

normal.

Pounding. 

Air chambers in piping have 

Drain piping system and refill.

   

become waterlogged. 

Heater must be off while this is

   

 

being done.

Combustion noises. 

Too much primary air. 

Adjust shutters. 

   

Overfired heater; Incorrect 

Call serviceman. 

Check and correct as necessary.

   

burners or orifice for type

   

of gas used.

Water leaks. 

Drain valve not closed 

If drain valve cannot be closed

   

 tightly. 

tightly, replace.

   

If leakage source cannot 

Shut off gas supply to heater 

Repair or in case of suspected tank leakage,

   

be corrected or identified, 

and close cold water inlet valve 

be certain to confirm before replacing heater.

   

call serviceman. 

to heater.

Gas odors. 

Heater is overfired. 

Shut off gas supply to heater 

Check for sooted flue passage.

   

 

and call a serviceman.

   

 

 

Check for obstructed vent line.

   

 

 

Check backdraft or lack of draft.

   

Possible gas leaks. 

Shut off gas supply to heater and

   

 

call gas company at once.