Raypak Pool Heater Error Codes: What They Mean and What to Check

Water Sw Open means the water pressure switch isn't sensing enough flow, so the heater won't fire. Most often the pump is off or slow, the filter or baskets are dirty, or a valve is closed. On wiring diagrams and some older shorthand lists this same switch is labeled PRS. The display still reads Water Sw Open.

You can check that the pump is running and primed, the pump and skimmer baskets are clean, the filter is clean or backwashed, the valves are open, and a variable-speed pump is not set too low. If Water Sw Open stays with the pump running, a technician should check flow through the heater and the pressure switch. That is pro work.

Digital Installation & Operation Manual 241236 Rev. 50, Table Q, and AVIA Installation & Operation Manual 100-10000111 Rev. 12, Table Q, both list Water Sw Open as the water pressure switch open. See pool pump repair and pool filter repair.

Hi Limit 1 is open and Hi Limit 2 is open mean a high-temperature limit switch opened because water in the heater got too hot. Low water flow is the usual cause. On ASME Digital units only, these are manual-reset faults cleared with the MODE button. On non-ASME units they recover on their own once the water cools.

Check flow first, the same checks as Water Sw Open. Raypak's high-limit note says to keep the pump running during the heat cycle and leave it on a few minutes after heat stops so residual heat doesn't trip a limit again. Internal bypass and Unitherm Governor checks are pro work. Shorthand HL1 and HL2 mean these messages. The display words stay Hi Limit 1 is open and Hi Limit 2 is open.

One MODE clear of an ASME high limit is OK after flow is restored. If the same message returns, stop and call. AVIA shows Hi Limit 1 Fault and Hi Limit 2 Fault, and those recover on their own once the water cools. 241236 Rev. 50, Table Q, is the Digital source.

The heater tried to light and couldn't prove a pilot flame, or it lost the main burner after the pilot lit, so it locked out. The display often alternates with "No pilot sensed" or "Main Ign Failure." Common causes are a gas supply problem, a worn igniter or pilot, or a gas valve or control fault.

On a Digital heater, 241236 Rev. 50 lists Ignition Lockout and Ignition Failure with the 15-second or 90-second pilot window. Ign 60 min Delay means the pilot flame was lost four times during the trial to light the main burner, and the heater waits 60 minutes. AVIA's own ignition wording is in the AVIA section below.

Make sure other gas appliances work and the propane tank isn't empty. Don't turn gas valves or open the heater; call us or your gas company.

We repair and replace gas and propane pool heaters. Gas line work, including new runs and changes to existing lines, is done by our licensed gas contractor, with permits where required.

Everything inside the heater: call.

These are temperature-sensor (thermistor) faults. On Digital, Sensor Failure means the two thermistors disagree by more than 2°F. Sensor Open and Sensor Short mean one sensor failed open or short. They need a technician with a meter.

AVIA splits the sensors into In Sensor Fault, In Sensor Open, In Sensor Short, Out Sensor Open, Out Sensor Short, Flue Sensor Open, Flue Sensor Shrt, and Sensor Misplaced. Aggregator shorthand SNS maps to this family. The display uses Raypak's words, not SNS. It is usually a failed sensor, a loose plug, or the control board. 241236 Rev. 50, Table P, and 100-10000111 Rev. 12 list these messages.

Rollout Sw Open means the flame rollout switch opened. That is a safety trip that stops the heater when flame leaves the burner area. Shut the heater off and call. Don't keep resetting it.

Leave it alone. A technician checks for a blocked heat exchanger, soot, venting, combustion air, and gas pressure. This page does not give a location or a replacement procedure. Shorthand ROL means this message. The display reads Rollout Sw Open. 241236 Rev. 50, Table Q, lists it.

Clock/Fireman Sw means the time-clock or fireman-switch circuit that shuts the heater down before the pump is open. Vent/Field Sw #1 means a vent spill switch or field switch #1 is open. Flow/Field SW #2 means a field-supplied flow switch or field switch #2 is open. All three stop a call for heat until that circuit closes.

If a time clock or automation runs the pump and heater, confirm the heater isn't being told to shut down early. Keep the vent clear of leaves and nests. Switch and wiring checks are pro work. See pool automation repair. 241236 Rev. 50 lists these circuits in Tables P and Q.

Flame w/o CFH means the board senses flame while both gas valves are commanded shut. Shut the heater off and call. Don't reset it. Internal Fault is a board fault. EEPROM Fault is a memory fault: after setpoints are reset, if it returns, the board needs a technician.

Shorthand BD1 and EEP on aggregator pages map here. Use the display words Flame w/o CFH, Internal Fault, and EEPROM Fault. We repair anything electrical on your pool, from pumps, heaters, and automation to timers, salt systems, and pool lights, and connect or disconnect it on your existing circuits. Call a technician.

AVIA (264A/404A) adds flow and combustion messages Digital atmospheric units don't show the same way. Low Flow Fault and High Flow Fault mean the control sees flow outside its expected range, which can be scaling or condensation. Fan Lockout means the air switch faulted three times in one heat call and needs a power cycle. Call a technician. Flue Over Temp, Flue Low Temp, and Flue Extreme Low are exhaust-temperature faults.

Check flow the same way as Water Sw Open, and keep the air inlet and vent clear. For Fan Lockout, Ignition Lockout, or Flue Over Temp, a technician handles the reset. 100-10000111 Rev. 12 says Ign Try Failure means the unit failed to ignite on the first or second try, and Ign 60 min Delay means the gas valve failed 3 times in one call for heat. That wording is AVIA's only.

Air SW Open, Diff Sw Open, Diff Sw Closed, Diff Sw Fault, Cabinet Temp Lm, Outlet Over Temp, and Call Service are faults to hand to a technician. Call a technician. RP-P-600-5 is the AVIA technician guide.

Many Raypak messages clear on their own once the problem is fixed. On ASME Digital units, Hi Limit 1 and Hi Limit 2 clear with the MODE button. If the same message returns, stop and call.

One MODE clear of an ASME high limit is OK after flow is restored. Never keep resetting Ignition Lockout, Rollout Sw Open, or Flame w/o CFH. CLEAR FAULTS only clears the history. It does not fix the cause. Digital and AVIA controls use MODE for these faults, and AVIA also has a SERVICE key. There is no separate consumer reset button for these faults.

Fan Lockout, Ignition Lockout, and Flue Over Temp on an AVIA need a power cycle. Call a technician. 241236 Rev. 50 and 100-10000111 Rev. 12 describe the MODE clear. This page does not give menu steps.

This guide covers Raypak Digital gas pool and spa heaters (models 206A, 266A, 336A and 406A as Raypak prints them) and Raypak AVIA gas heaters (264A/404A). If your heater shows a message not listed here, note the exact text and the model on the rating plate, and call.

The messages come from Digital Installation & Operation Manual 241236 Rev. 50 and AVIA Installation & Operation Manual 100-10000111 Rev. 12. Digital Tool Box Guide 6500.00 and AVIA Tool Box Guide RP-P-600-5 are the technician references for those checks. Digital Low NOx ASME 207A–407A and Professional Series Digital 268A/408A share most Digital messages and add Fan Lockout and Fan 5 Min Delay.

Heat pumps, above-ground heaters, commercial heaters, and millivolt-only heaters are outside this guide. See heat pump repair for a heat pump.

We service and repair all pool equipment brands, including Jandy, Pentair, and Hayward. We are an Authorized Jandy ProEdge Warranty Station and can also help with Pentair and Hayward warranty claims.

Check flow, power, gas supply and the area around the heater yourself. Anything inside the cabinet, any gas part, and any message that returns after those checks is a job for a technician.

Don't open the heater or touch gas parts.

Most messages point to a part that can be repaired or replaced: a pressure switch, sensor, igniter, limit switch, blower or board. Replacement makes sense when the heat exchanger has failed or repairs keep stacking up.

Repair first, whatever the brand. When replacing, we usually recommend Jandy. The customer chooses, and if they'd rather stay with Raypak, we supply and install it. The reason is the 3-year warranty on new Jandy equipment we install.

Low pH, high sanitizer, or high pH, alkalinity, or calcium can damage the heat exchanger. See residential pool maintenance.

See pool heater repair in Fort Worth and DFW. See pool repair in Fort Worth and DFW. Related guides: Jandy heater error codes, Pentair heater error codes, and Hayward heater error codes.

Check your install paperwork and the model and serial number on the heater's rating plate. We are an Authorized Jandy ProEdge Warranty Station and can also help with Pentair and Hayward warranty claims.