Model GL indirect-fired water heaters — Product Manual
Troubleshooting
(continued)
Insufficient
hot water
Undersized water heater?
Boiler system improperly sized?
Check component parts.
Check boiler operating tempera-
tures.
Check location of flow control
devices.
Check for air in the system.
Clean the boiler water system.
Check tank thermostat setting.
29
Excessive
domestic water
temperature
Reduce stacking
• Lower boiler operating tempera-
ture.
Install a thermostatic mixing valve.
Install a recirculation loop.
32
Boiler relief valve
lifting or weeping
Undersized expansion tank?
Faulty boiler expansion tank?
Faulty boiler relief valve?
Faulty boiler fill valve?
33
Temperature/
pressure relief
valve lifting
or weeping
Undersized or missing domestic
water side expansion tank?
Faulty domestic water side expan-
sion tank?
Faulty T & P relief valve?
High domestic water supply pres-
sure?
Possible water hammering or pres-
sure spikes?
Check boiler operating tempera-
ture.
34
Water on the
floor near the
tank
Check for leaks from sources other
than the water heater.
T & P relief valve lifting and dis-
charging?
Loose piping connections?
35
Top of tank or
insulation wet
Check for leaks from sources other
than the water heater.
Loose piping connections?
35
Water quality
problems
Water smells like “rotten eggs.”
Milky water.
Discolored water from the hot
water faucet.
37
Typical problems and causes and page location for details
Problem Check possible causes Page
Part number GL-E224-ADOC 0413
28
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