Question about Honeywell HZ2110 Utility Heater
I have seen some thermostats that have a ceramic stem attached to the inside end of the control shaft. The ceramic stem is non-conductive and heat-resistant. If this stem is broken or missing, then turning the knob will have little or no effect.
The solution is to replace the thermostat.
Posted on Mar 22, 2008
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Posted on Jan 02, 2017
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Oct 19, 2016 | Heating & Cooling
May 03, 2011 | Heating & Cooling
The pressure switch is located in the front header, behind the
upper side jacket panel, above the water connections. When
required, the pressure switch can be reset with the following
1. Clean filter and skimmer.
2. Start filter pump.
3. Set digital thermostat to highest setting.
4. Turn the adjustment knob on the pressure switch clockwise
until the combustion air fan in the front control panel turns
off. Fan will not turn off if system pressure exceeds 5 PSI.
5. Slowly turn the adjustment knob counter-clockwise until the
combustion air fan turns on. Turn knob an additional ¼ turn
6. Turn filter pump off and on several times. The heater should
shut down immediately when the pump stops.
7. If the heater does not shut down immediately as the filter
pump stops, repeat steps 4, 5 and 6 until proper operation
8. Reset thermostat to desired temperature setting.
If after doing all of the above you still have the problem.... you can remove the switch and check for debris in the water passages. If you find debris remove it, reinstall the switch and repeat steps above.
- Still have the problem... Replace the switch.
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