I have been battling the problem for several months where my hot water will all of a sudden get very hot and then shut off copmpletely. I called the tech support and learned how to use the diagnostic capabilities and found out that my hot water shut off was due to a decrease in flow through the hot water heater. The unit needs at least a 0.7 gpm flow rate for the burner to work properly. When I turned on my cold water along with my hot water I could watch my hot water flow rate slow down to the point that the flow was not enough to work properly. Just to prove it to myself I then turned on a sink hot water faucit while running my shower as if I were taking a shower just to keep up the minimum flow rate and what do yo know............ I had constant flow and constant hot water exactly the temp I had it set for. My problem seems to be with my shower and tub controls. As long as I maintain a 0.7 gpm flow rate my hot water system works great.
Darrell
Water temp setting should be appx 120, any higher heat exchanger trips on overload and you must reset each time..
Occasionally, the high temperature limit shut off device may trigger and shut the
system down. This occurs when water temperature exceeds 190° F and shuts off
power to the heating element. The shut off device may also trigger from a power
outage or electrical storm.
To reach the thermostat:
1. Pry off the round cover plate (V Fig. 3/1) from its right hand edge (W Fig. 3/1) with
a small flat-head screwdriver.
2. Remove the Phillips screw revealed beneath the round cover plate.
3. The cover (C Fig. 3/1) can now be removed by pulling out its left-hand edge. When
reassembling, work in the opposite way being careful to insert the tongue of the
cover into the slot.
4. Firmly press reset button (B Fig. 4). Reconnect power.
5. IMPORTANT: Check the operation of the thermostat, turn temperature dial from
high to low, if the red light does not go off on low setting, turn off power supply and
call a service person to replace the thermostat.
6. If the system works, place dial setting to desired setting. Note: a lower setting is
more economical and reduces the risk of scalding. Replace cover plate.
CAUTION: Call a technician if the high limit needs to be reset frequently.
Occasionally, the high temperature limit shut off device may trigger and shut the
system down. This occurs when water temperature exceeds 190° F and shuts off
power to the heating element. The shut off device may also trigger from a power
outage or electrical storm.
To reach the thermostat:
1. Pry off the round cover plate (V Fig. 3/1) from its right hand edge (W Fig. 3/1) with
a small flat-head screwdriver.
2. Remove the Phillips screw revealed beneath the round cover plate.
3. The cover (C Fig. 3/1) can now be removed by pulling out its left-hand edge. When
reassembling, work in the opposite way being careful to insert the tongue of the
cover into the slot.
4. Firmly press reset button (B Fig. 4). Reconnect power.
5. IMPORTANT: Check the operation of the thermostat, turn temperature dial from
high to low, if the red light does not go off on low setting, turn off power supply and
call a service person to replace the thermostat.
6. If the system works, place dial setting to desired setting. Note: a lower setting is
more economical and reduces the risk of scalding. Replace cover plate.
CAUTION: Call a technician if the high limit needs to be reset frequently.
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Element Locknut - 4 Each Req. Per Element - sold each
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Thermostat for GL6
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I turned the temp down to 120 and it had the same problem.
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