15
LP-04 REV. 4.15.14
T&P Relief Valve Maintenance Instructions:
Annually:
Certain naturally occurring mineral deposits may adhere to the valve, blocking waterways and rendering the valve
inoperative. The T&P Relief Valve lever must be operated to ensure the waterways are clear. If waterways are clear, hot water
will discharge from the valve. Take precautions to avoid personal injury and property damage from contact with hot water.
Before operating lever, check to see that a discharge line is connected to the valve, directing the flow of hot water from the
valve to a proper place of disposal.
Replacement of the valve is required if no water flows when the lever is operated. Turn the water heater off until the valve is
replaced.
If water flows from the relief valve, drain a few gallons from the tank to ensure water flows freely.
At least once every three years:
To ensure that the
T&P relief valve has not been affected by corrosive water conditions and
that the valve and discharge line have not been altered or tampered with illegally, relief valves should be inspected, and
replaced, if necessary, by a licensed plumbing contractor or qualified service technician.
FAILURE TO COMPLY WITH THE ABOVE GUIDELINES COULD RESULT IN FAILURE OF RELIEF VALVE OPERATION,
RESULTING IN POSSIBILITY OF SUBSTANTIAL PROPERTY DAMAGE, SEVERE PERSONAL INJURY, OR DEATH.
6. Turn power supply off to the water heater. Open the drain valve and drain a few gallons of water from the tank to clear the tank of
any hard water deposits. Once complete, close the drain valve and restore power to the water heater.
PART 7 – TROUBLESHOOTING
The following table details operating issues, possible causes, and service remedies.
ISSUE
POSSIBLE CAUSE
SERVICE REMEDIES
No Hot Water
1. Manual disconnect switch turned off
2. Improper Wiring
3. No Power
– blown fuse or circuit breaker
tripped
a. Shorted wiring
b. Circuit overloaded
c. Improper wiring
d. Grounded element or thermostat
4. Manual Reset High Limit Switch (ECO) open
a. Thermostat(s) defective
b. Thermostat out of calibration
c. Heat build-up due to loose wires
d. Defective High Limit Switch (ECO)
1. Turn switch ON
2. *Rewire per Fig. 5, Wiring Detail
3. Replace fuse or reset breaker
a. *Replace or repair
b. *Provide adequate circuit to
reduce load
c. *Rewire per diagram
d. *Replace
4. Refer to Part 5, Sections A and B, this manual
a. *Replace thermostat
b. *Lower thermostat setting or replace
c. *Tighten wire connections
d. *Replace
Not enough
Hot Water
1. Heater undersized
2. Defective Element(s)
3. Miswired or defective thermostat causing only
one element to work
1. Reduce rate of hot water use
2. *Check amperage, replace
element if low
3. *Check wiring or replace
Water too hot
or not hot
enough
1. Thermostat setting too high or low
2. Thermostat out of calibration
3. Thermostat access panel(s) and/or insulation
not in place
4. Thermostat(s) not resting tightly against
mounting plate
1. Change setting as required
2. *Replace
3. Inspect and replace as needed
4. Inspect and insure that retaining spring(s) or mounting screws
hold thermostat(s) tightly to mounting plates
Noisy heating
element(s)
Hard water scale built up on element(s)
*Remove and clean
Water leaks
1. Loose connection between inlet/outlet piping,
relief valve, or drain valve and hex nut union on
tank fittings
2. Damaged seal ring washer
3. Gasket around heating element(s)
1. Tighten hex nut union fitting
2. Replace seal rings as required
3. Inspect and replace gasket if necessary
Leaking
Temperature
and Pressure
Relief Valve
1. Improperly seated valve
2. Thermal expansion in closed water system
3. Damaged/defective valve
1. Attempt to reseat valve by opening and closing handle
2. Install a thermal expansion tank
3. Replace relief valve
NOTE:
DO NOT plug T&P valve under any circumstances
Hot Water
Odor
1. High sulfate or mineral content in water supply.
2. Bacteria in water supply.
1. Drain and flush water heater. Refill
2. Check with local water treatment specialist or utility to identify
and address this problem.
Table 3
– Troubleshooting – *NOTE: This maintenance should only be performed by a qualified service provider.
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