Question about Raypak RP2100Digital Gas Heater Control Panel

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Heater goes on and off

Check hi limits and pressure switch no problem

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If wired 120 volt check wiring

Posted on Apr 27, 2016

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1 Answer

How to check if you have a bad pressure switch or hi limits are not on correctly


check to see if pressure switch has 24 volts on both sides if not check copper syphon loop to see if plugged

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How to fix a pressure switch on a goodman Gms807034ana


Since the burners light this eliminates the pressure switch as the problem. Typically when the burners come on and shut off quickly a flame sensor, ground problem or the limit switch tripping are the main reasons. Since the flame sensor has been replaced, check the limit switch

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check gas pressure then replace highlimit rollout switch if ok replace hi limits in header

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Burners come on for about one minute and flame goes out, is it the hi limit or temp control


hi limit or pressure switch try jumping them out and see if it works

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1 Answer

Heater fires up and is hot but does not heat the water. Raypak Versa bronze


This unit must have adequate water flow and apparently needs to be checked for proper operation.

Consider the following:

The unit as manufactured is equipped with:
  • pressure switch - likely stuck in the on condition, or been has been bypassed
  • Thermostat - Needs to be checked to insure it is properly working and calibrated.
  • Hi-limit switches - need to be checked to insure they are working and not bypassed.
  • flame sensor - prevents flame from leaving the firebox and damaging control area. (if equipped)
  • Flow Governor - controls water flow through the heat exchanger to prevent over pressure.
If the pressure switch is working properly, a blockage after the heater, would create pressure, but not enough flow. Check for a closed valve or obstruction in the plumbing.

If the problem is a clogged filter, and the filter is located before the heater, then the pressure switch is NOT working correctly and needs to be replaced or adjusted to factory settings. Remove the filter cartridge and check for flow.

Bottom line is:

No flow and no pressure, - heater should not come on.
No flow, but pressure, heater would come on and overheat, tripping hi-limit.
Good flow, heater would come on and spa would heat.

Nov 26, 2010 | Raypak Hood shown but not included. A...

1 Answer

Getting LO error


Lo is an error code dealing with the safety loop, hi limit switches, water pressure switches. Check for continuity and the wiring between the hi limit switches and the water pressure switch. Also, check to make sure the filter is clean and the pump basket is empty. These also can cause a low flow situation that will cause the pressure switch to not close properly.

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Gettin LO error on display


Lo is an error code dealing with the safety loop, hi limit switches, water pressure switches. Check for continuity and the wiring between the hi limit switches and the water pressure switch. Also, check to make sure the filter is clean and the pump basket is empty. These also can cause a low flow situation that will cause the pressure switch to not close properly.

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1 Answer

LO error message on heater. Everything shuts off after a few minutes of running.


On of your limits is not working or not wired up. An easy way to check the limits - Water pressure switch, Hi limits, air pressure switch all of which have 2 wires going to them. Unplug one item and connect the 2 wires together ( paper clip works fine ) Then retest, if problem does not go away remove paper clip and reconnect wires and move to the next limit. Always make sure water is flowing through the heater at all times while checking the limits.

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1 Answer

HAYWARD POOL HEATER FIRES FOR 5 MIN. THEN GOES OUT


Sounds like it is cycling on high limit; causes are related to water flow through the heat exchanger or a faulty high limit(doubtful given the heater cycles back on). Check the internal bypass for obstructions; has anyone worked on it recently? There are usually two high limit switches with different trip temperatures; installing the wrong one could also be the culprit. Does the heater "bang" before it goes off (a sign that the water is boiling inside the tube bundle)?





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1 Answer

Goodman heater not turning on


If your pressure switch is clogging then you need to check the flue pipe make sure it is not rusting. If it is the flue should be replaced and also think about replacing the pressure switch. Check your high limit switch also. If the pressure switch goes sometimes it pops the high limit

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