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50 www. reliancewaterheaters .com 100309035_2000560888_Rev. A
TROUBLESHOOTING GUIDELINES
These guidelines should be utilized by a qualified service agent.
PROBLEM POSSIBLE CAUSE(S) CORRECTIVE ACTION
BURNER FLAME
TOO HIGH
1. Air inlets blocked
2. Insufficient secondary air
3. Orifice too large
1. Unblock inlet air openings
2. Provide ventilation to water heater
3. Replace with correct orifice
FLAME BURNS
AT ORIFICE
1. Low gas pressure
2. Defective gas control valve/thermostat
1. Check with gas utility company
2. Replace gas control valve/thermostat
INSUFFICIENT
HOT WATER
1. Low gas pressure
2. Orifice too small
3. Thermostat set too low
4. Gas control error codes
5. Sediment or lime in tank
6. Water heater too small
7. Wrong piping connections
8. Leaking faucets
9. Wasted hot water
10. Long runs of exposed piping
11. Hot-water piping in outside wall
1. Check with gas utility company
2. Replace with correct orifice (see rating
plate)
3. Turn temperature knob to higher
setting
4. Refer to gas control error codes
5. Drain/flush-provide water treatment if
needed
6. Install adequate heater
7. Correct piping: dip tube must be in cold
inlet
8. Repair faucets
9. Advise customer
10. Insulate piping
11. Insulate piping
WATER IS TOO HOT
1. Thermostat is too high
2. Incorrect or missing vent screen in vent
termination
3. Defective gas control valve/thermostat
1. Turn temperature knob to lower setting
2. Check venting for correct screen
3. Replace the gas control valve/
thermostat
SLOW HOT WATER
RECOVERY
1. Insufficient air/flue blockage
2. Low gas pressure
3. Orifice too small
4. Thermostat set too low
5. Heater too small
6. Wrong piping connection
7. Wasted hot water
8. Flue clogged
9. Air inlets blocked
1. Provide ventilation to water heater.
Check flue way, flue baffle and burner
2. Check with gas utility company
3. Replace with correct orifice (see rating
plate)
4. Turn temperature knob to higher
setting
5. Install adequate heater
6. Correct piping-dip tube must be in cold
inlet
7. Advise customer
8. Clean flue, locate source and correct
9. Unblock inlet air openings
DRIP FROM
RELIEF VALVE
1. Pressure build-up
2. Heater stacking
3. Closed water system
4. Improperly seated valve
5. Water overheating
1. Use a pressure-reducing valve and
relief valve
2. Lower the thermostat setting
3. See “Thermal Expansion” section
4. Check Relief valve for proper operation
(Do Not plug T&P valve)
5. Check venting for proper vent
termination screen. Check valves in
loop system stuck or missing.
GAS CONTROL VALVE/
THERMOSTAT FAILS TO
SHUT OFF
1. Defective gas control valve/thermostat 1. Replace gas control valve/thermostat
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