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Blows thermal fuse on raypack heater? - Raypak Rp2100 Pool & Spa Heater Lonox 407k Btu Natural Gas Polymer Header Digital Rp407aenc

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If you are talking about the "Roll out sensor" located on the lower left hand side, you have a problem with ventilation..Soot,debris, or possibly a rodent nest on the heat exchanger (Located just under the top cover of the heater). If it is electrical, you may have a bare wire touching the heaters housing (somewhere inside) causing a short. Rodents love to chew the insulation off low voltage wiring.

Posted on Oct 09, 2010

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Posted on Jan 02, 2017

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E28 error. Why does the thermal fuse keep blowing out?


If the thermostat is not functioning properly the heater will run "wide open" and overheat.

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Atmospheric heaters are equipped with a thermal cut off device to prevent flame roll-out in the event the heat exchanger becomes blocked. This is a single- use type fusible link or thermal fuse that must be replaced when disabled by an over-temperature condition caused by excessive restriction in the heat exchanger flue passage.
Look to see what has blocked the flue.

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WHIRLPOOL LEC8858EQO


If the drum is turning and air is blowing then the most likely causes are thermal fuse trip, thermostat fault or heater fault.
Some good points mentioned on this site.

http://wiki.answers.com/Q/Why_wont_my_whirlpool_electric_dryer_heat_up

Discussion about thermal fuse on this site.http://www.appliancejournal.com/appliance-parts/whirlpool-appliance-parts/whirlpool-dryer-thermal-fuse-3390719-64/

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How to repair a Raypack pool heater that displays a ROL fault code?


simply replacing the roll out fuse wont solve your problem. those safeties open from an over temp situation or negative pressure down draft. clean out any dirt and debri from venting, inspect the underside of heat exchanger for build up or soot. ensure you have proper combustion/ventilation air openings if heater is in a shed. if heater is outdoors, Raypack is notorious for getting downdrafts back down the draft hood causing burner flames to come outside the burner box

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I have a Kenmore Series 70 Dryer and I changed the thermal fuse got hot for a few minutes the model #110.74722400


The cycling thermostat must also be replaced when replacing the thermal fuse. The cycling thermostat's failure to cycle off the heating element results in overheating of the dryer which consequently blows the thermal fuse open.

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Replacing only the thermal fuse should the dryer stops running and fails to start will result in its premature blowing or even the thermal cut-out (cut-off) located on the heater duct. Like the cycling thermostat, the high-limit thermostat must also be replaced once the thermal cut-out blows open. Refer to the parts diagram in the link below and look for item numbers 31(thermal cut-off), 34(hi-limit thermostat), 39(thermal fuse), and 41(cycling thermostat.

Kenmore Series 70 Electric Dryer (110.74722400) Bulkhead Parts

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1 Answer

Raypack pool heater indicates ROL. How do I fix it? There is no red reset button on my heater. Please advise


ROL is a Roll-Out code. There is a one time use thermal switch that is white, oval and ceramic which is located inside the heater cabinet on the left hand side. This switch costs only about $8 and will need to be replaced. Typically these do not fail unless there is a bigger problem with the heater such as incorrect gas supply, incorrect venting, high wind conditions (if outdoor), clogged or dirty heat exchanger, etc. So it is a cheap fix, but make sure you moniter the heater carefully when you replace the switch so that you dont damage the heater. Another common cause of a rollout is sooting, or debris on top of the burner tray.

part number for rollout fuse is 005899F
this can be purchased anywhere at an online pool parts store.

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1 Answer

I have a Rheem raypack pool and spa heater. I have an error message in the display: "ROL". Can you please describe the issue and possible solutions. Thanks, Stan.


Error Code ROL is "HEAT ROLL-OUT SAFETY SWITCH OPEN". The heater is equipped with a cutoff device to prevent flame roll-out in the event the heat exchanger becomes blocked. This is either a "manual reset", or "Single-use" type fusible link/thermal fuse, that must be replaced or reset after any over temperature conditions have been fixed. Excessive restriction in the heat exchanger flue passage may cause the switch to disable the heater. I don't know your exact model so I'm just generalizing. If you reset or replace the switch, and it trips/burns out again, then you need to address what is causing it. make sure the heater is cleaned out well and no debris is blocking the flue. I fthis doesn't help you can always try calling Raypak Service department at (805) 278-5300.

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1 Answer

The thermal fuse in my Raypak 105B pool heater keeps blowing.


The thermal fuse react to rollout flames from the burner. Whatever caused your first one to fail caused the second and will continue to be a problem until fixed.

You could have a clogged up heat exchanger from soot and/or debris. You can also have problems with clogged burner tubes.

Finally, you could simply have wind issues that would require a high wind stack being installed on the heater to correct.

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2 Answers

Thermal fuse keeps blowing


Mr. Larry (guru?)
The thermal fuse is just that It doesn't protect the circuit from over current although it certainly can open in that case. It is there to protect the board from overheating , thus the term thermal. The dishwasher could be allowing the water to heat too hot or the water heater in the home is turned up too much. The heater could also be shorted to case thus allowing it to be on even though the control is not calling for it especially if the polarity is incorrect to the dishwasher or the relay on the board could be welded closed so that the heater can't turn off even though the thermostat is satisfied. The best thing is to get a person who can check these things. You don't necessarily need to change the board with a fuse. I have changed many fuses with no other problems and verified that the machine was still working years later. sometimes the fuse just blows!

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1 Answer

Dryer Thermal Fuse


air flow could be the issue or if your heater itself is grounded against the cabinet i think your unit is getting to hot check all your vent lines if you have good air flow check the heater try taking the vent totally off for a few cycles and see if the fuse blows agian

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