lp-608 Rev. 000 Rel. 001 Date 3.15.18
16
Part 8 - Troubleshooting
Problem
Reason
Remedy
No Hot Water
Manual disconnect switch turned off
Turn switch on
Blown fuse or circuit breaker tripped
Diagnose system for possible short circuit or
malfunction. Replace fuse or reset breaker.
Circuit overload
Provide adequate circuit for load
Grounded element or thermostat
Repair or replace defective part(s)
Manual Reset High Limit open
1. Thermostat defective or out of calibration
2. High Limit defective or out of calibration
3. Heat build-up due to loose wires
Refer to Part 6, this manual.
1. Replace upper thermostat assembly
2. Replace upper thermostat assembly
3. Repair wire connections
Improper wiring
Check and rewire per Wiring Detail
Utility Control limiting energy usage
Contact System Technician
Not Enough Hot
Water
Heater undersized
Reduce rate of hot water use or replace with larger wa-
ter heater
Defective element(s)
Check amperage, replace element(s) if low
Wired incorrectly or defective thermostat causing only one
element to work
Check wiring or replace thermostat
Utility Control limiting energy usage
Contact System Technician
Water Too Hot or
Not Hot Enough
Mixing valve setting too high or low
Refer to mixing valve manufacturer instructions for set-
ting the mixed temperature
Mixing valve out of calibration
*Replace mixing valve
Thermostat setting too high or low
*Change setting as required.
Thermostat out of calibration
*Replace thermostat
Thermostat access panel(s) and/or insulation not in place
Inspect and replace as needed
Thermostat not resting tightly against mounting plate
Ensure that retaining spring(s) or mounting screws hold
thermostat tightly to mounting plates
Thermostat setting too high or low
*Change setting as required
Utility Control limiting energy usage
Contact System Technician
T&P Valve
Discharges
Improperly seated valve
Open and close the handle to try to reseat valve
Thermal expansion in closed water system
Install a thermal expansion tank
Damaged / defective valve
Replace T&P relief valve
NOTE:
DO NOT plug T&P valve under any circumstances
Water Leaks
Loose connection between inlet / outlet piping, relief
valve, and/or hex nut union on tank fittings
Tighten fittings
Damaged element seal ring washer
Replace seal rings as required
Gasket around heating element(s)
Inspect and replace gasket if necessary
Hot Water Odor
High sulfate or mineral content in water supply
Drain and flush water heater. Refill.
Bacteria in water supply
Check with local water treatment specialist or utility to
identify and address this problem.
Noisy Operation
Hard water scale built up on element(s)
*Remove element and clean
Table 5 - Troubleshooting - *See Scald / Electric Shock Warnings and Caution Statements, this page.
If draining of the water heater is necessary, open the T&P valve or
a hot water tap to prevent vacuum buildup in the tank and piping.
The risk of scald injury increases as you increase water temperature.
Use a water tempering or mixing valve and extreme caution when
using hot water to avoid scald injury. Consult codes for conformance.
Failure to follow these instructions could result in serious personal
injury or death.
Be sure to disconnect electrical power before performing service.
Failure to do so could result in electrical shock, property damage,
serious personal injury, or death.