Question about Jandy Laars LX Pool Heater / 400,000 BTU / Natural Gas

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Ext SW1 error message...I have shorted the flue gas vent limit switch and fuse but still get the message....any ideas? Karl

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Check gas pressure if too low will soot up and overheat

Posted on Jan 30, 2016

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EXT SW1-FUSABLE LINK/VENT SWITCH OPEN ON JANDY POOL HEATER


Open up the front panel on the heater you will see 2 white wires going to the thermal fuse, pull both leads off the thermal fuse ,take a jumper wire and connect it between the two wires . Does the fan come on ? if so remove the jumper, if not put the leads back on the thermal fuse and remove the thermostat panel on the top of the heater on the right side there will be 2 screws on the bottom of the panel remove them and pull the panel up and out of the way as much as possible look inside to top right in about the middle of the heater you will see 2 white wires going to a switch (overheat switch) with a red button in the middle, push on that button and reset it, if the fan still does not come on take your jumper wire and put it between the 2 white wires on the overheat switch does the fan come on? If it does great but don't leave the jumper in , remove it and put in a new overheat switch ,but that only fixes the switch because there is still a problem of why that happened. First thing is to check the heat exchanger for soot build up or a blocked exhaust fan and check your gas pressure my guess is it is low. But do not run that heater with any bypass jumpers in or your asking for a fire .

Apr 14, 2013 | Jandy Laars LX Pool Heater / 400,000 BTU /...

1 Answer

Evcon limit switch


Check for reduced air flow both return air filter (if equipped) and supply vents, make sure the flue is clear and heat exchanger is not cracked, the limits will go bad, but wont hide a bad exchanger if replaced.

Oct 29, 2012 | Dayton Gas Furnace Heater

1 Answer

Getting A2 code and hot water shuts off. We do a reset and hot water will run for awhile then we get A2 code and no hot water again.


Thanks for stopping by:

A2 error on your Bosch water heater means "Fault in the flue gas limiter"

This can be caused by several things:
The gasket on the flue gas collector may be dislodged/leaking.
Check/Remove/Reseat the gasket.
It will not reset until about a two hour cool down.

Also - check the overheat sensor fuse wire - it may have gotten hot and melted the jacket and/or been dis-colored.

Finally - there is a retrofit kit "repair" that can be obtained by calling them directly.

1-800-642-3111 and request the "FLUE GAS LIMITER RETROFIT", Part NO. 8-700-400-032. This should solve many error code situations and get you on your way again.


Thanks for using FixYa!!

Aug 03, 2011 | Bosch & Tankless LP Hot Water Heater

1 Answer

Our Rinnai Infinity HWS is displaying error message 12 and no hot water is available


Hi,

The following could cause this. I would call a licensed plumber to fix this issue.

Check that the gas is turned on at the water heater and gas meter. Check for obstructions in

the flue outlet.

Ensure gas line, meter, and/or regulator is sized properly.

Ensure gas type and pressure is correct.

Bleed all air from gas lines.

Ensure proper Rinnai venting material was installed.

Ensure condensation collar was installed properly.

Ensure vent length is within limits.

Verify dip switches are set properly.

Ensure appliance is properly grounded.

Disconnect keypad.

Disconnect EZConnect™ or MSA controls to isolate the problem.

Check power supply for loose connections.

Check power supply for proper voltage and voltage drops.

Ensure flame rod wire is connected.

Check flame rod for carbon build-up.

Disconnect and reconnect all wiring harnesses on unit and PC board.

Check for DC shorts at components.

Check gas solenoid valves for open or short circuits.

Remove burner plate and inspect burner surface for condensation or debris.


The above is what #12 indicates.


No way to fix it without further hands on investigation. I seriously recommend you call a licensed plumber.


Let me know,if needed further assistance.


Hope i helped you.


Thanks for using ' Fixya ' and have a nice day!!

Jul 13, 2011 | Heating & Cooling

1 Answer

We are in Canada and it has been extremely cold, however we continually are getting error code 10. Is there something we can do as we do not have hot water at all


10 Air Supply or Exhaust

Blockage

Ensure Rinnai approved venting materials are being used.

Check that nothing is blocking the flue inlet or exhaust.

Check all vent components for proper connections.

Ensure vent length is within limits.

Ensure condensation collar was installed correctly.

Verify dip switches are set properly.
Check fan for blockage.

Jan 15, 2011 | Rinnai RHFE-1004FA 38,400 BTU Energy Saver...

1 Answer

My Bosch AquaStar 240 NG tankless began throwing an error A2 and cuts off. I followed the trouble shooting guide, cleared the filter (which was pretty clogged), checked the fuse with a multmeter, fuse...


Hi,

  1. Check for flue gas leakage around the top and bottom seals of heat exchanger as well as the viewing window. Look for any noticeable burn marks or warping of the gaskets. If a leak is detected, seals will need replacing.
  2. Verify that venting meets specifications outlined in chapter 3.6 of the installation manual. Long vent lengths, incorrect venting material, venting with more than three elbows, blocked vent or combination venting may cause this failure. Verify backdraft flapper inside flue gas collector is not stuck shut.
  3. Check flue gas limiter wire connectors for tightness. Clean with pencil eraser if any corrosion is evident.
  4. Trace wires from flue gas limiter to black connector. Verify the connection is tight.
  5. If limiter is tripped due to overheating, it must cool down before error will clear on the control board.
If your connections are good and the CO2 level has not been an issue in the past you can start getting into replacing parts. Bosch technical help water line may help a little but they will want all of the make, model, serial number business as well as owner name before helping, at all. If your unit can be repaired a good technician is the answer.

Let me know,if needed further assistance.

Hope i helped you.

Thanks for using ' Fixya ' and have a nice day!!

Dec 09, 2010 | Bosch AquaStar 2400ES-NG

1 Answer

I have a 2000 Nissan Xterra SE V6. My center


Before you begin to diagnose and test the stop light system (that's what's it's called in the service manual), you should look at the following
wiring diagram to try and understand how the system work. This will help you to logically walk through the diagnosis process.

d660eb1.jpg
TESTING FOR “OPENS” IN THE CIRCUIT

7c178f9.jpg

Continuity Check Method
The continuity check is used to find an open in the circuit. The
Digital Multimeter (DMM) set on the resistance function will indicate
an open circuit as over limit (no beep tone or no ohms symbol).
Make sure to always start with the DMM at the highest resistance
level.
To help in understanding the diagnosis of open circuits please refer
to the schematic above.
1) Disconnect the battery negative cable.
2) Start at one end of the circuit and work your way to the other
end. (At the fuse block in this example)
3) Connect one probe of the DMM to the fuse block terminal on
the load side.
4) Connect the other probe to the fuse block (power) side of SW1.
Little or no resistance will indicate that portion of the circuit has
good continuity. If there were an open in the circuit, the DMM
would indicate an over limit or infinite resistance condition.
(point A)
5) Connect the probes between SW1 and the relay. Little or no
resistance will indicate that portion of the circuit has good continuity.
If there were an open in the circuit, the DMM would
indicate an over limit or infinite resistance condition. (point B)
6) Connect the probes between the relay and the solenoid. Little
or no resistance will indicate that portion of the circuit has good
continuity. If there were an open in the circuit, the DMM would
indicate an over limit or infinite resistance condition. (point C)
Any circuit can be diagnosed using the approach in the above
example.

Voltage Check Method
To help in understanding the diagnosis of open circuits please refer
to the previous schematic.
In any powered circuit, an open can be found by methodically
checking the system for the presence of voltage. This is done by
switching the DMM to the voltage function.
1) Connect one probe of the DMM to a known good ground.
2) Begin probing at one end of the circuit and work your way to
the other end.
3) With SW1 open, probe at SW1 to check for voltage.
voltage; open is further down the circuit than SW1.
no voltage; open is between fuse block and SW1 (point A).
4) Close SW1 and probe at relay.
voltage; open is further down the circuit than the relay.
no voltage; open is between SW1 and relay (point B).
5) Close the relay and probe at the solenoid.
voltage; open is further down the circuit than the solenoid.
no voltage; open is between relay and solenoid (point C).
Any powered circuit can be diagnosed using the approach in the
above example.

TESTING FOR “SHORTS” IN THE CIRCUIT

To simplify the discussion of shorts in the system please refer to
the schematic below.
c2ba473.jpg

Resistance Check Method
1) Disconnect the battery negative cable and remove the blown
fuse.
2) Disconnect all loads (SW1 open, relay disconnected and solenoid
disconnected) powered through the fuse.
3) Connect one probe of the ohmmeter to the load side of the fuse
terminal. Connect the other probe to a known good ground.
4) With SW1 open, check for continuity.
continuity; short is between fuse terminal and SW1 (point A).
no continuity; short is further down the circuit than SW1.
5) Close SW1 and disconnect the relay. Put probes at the load
side of fuse terminal and a known good ground. Then, check
for continuity.
continuity; short is between SW1 and the relay (point B).
no continuity; short is further down the circuit than the relay.
6) Close SW1 and jump the relay contacts with jumper wire. Put
probes at the load side of fuse terminal and a known good
ground. Then, check for continuity.
continuity; short is between relay and solenoid (point C).
no continuity; check solenoid, retrace steps.

Voltage Check Method
1) Remove the blown fuse and disconnect all loads (i.e. SW1
open, relay disconnected and solenoid disconnected) powered
through the fuse.
2) Turn the ignition key to the ON or START position. Verify battery
voltage at the battery + side of the fuse terminal (one lead
on the battery + terminal side of the fuse block and one lead
on a known good ground).
3) With SW1 open and the DMM leads across both fuse
terminals, check for voltage.
voltage; short is between fuse block and SW1 (point A).
no voltage; short is further down the circuit than SW1.
4) With SW1 closed, relay and solenoid disconnected and the
DMM leads across both fuse terminals, check for voltage.
voltage; short is between SW1 and the relay (point B).

GROUND INSPECTION

Ground connections are very important to the proper operation of
electrical and electronic circuits. Ground connections are often
exposed to moisture, dirt and other corrosive elements. The corrosion
(rust) can become an unwanted resistance. This unwanted
resistance can change the way a circuit works.
Electronically controlled circuits are very sensitive to proper
grounding. A loose or corroded ground can drastically affect an
electronically controlled circuit. A poor or corroded ground can easily
affect the circuit. Even when the ground connection looks clean,
there can be a thin film of rust on the surface.
When inspecting a ground connection follow these rules:
1) Remove the ground bolt or screw.
2) Inspect all mating surfaces for tarnish, dirt, rust, etc.
3) Clean as required to assure good contact.
4) Reinstall bolt or screw securely.
5) Inspect for “add-on” accessories which may be interfering with
the ground circuit.
6) If several wires are crimped into one ground eyelet terminal,
check for proper crimps. Make sure all of the wires are clean,
securely fastened and providing a good ground path. If multiple
wires are cased in one eyelet make sure no ground wires have
excess wire insulation.

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Apr 06, 2009 | 2000 Nissan Xterra

1 Answer

A2 error on Bosch tankless water heater


  1. Check continuity of the flue gas limiter (see Fig. 63, page 46 of manual). Go to steps two and three to determine air box temperature sensor fault and replace it.
  2. Check for flue gas leakage around the top and bottom seals of heat exchanger as well as the viewing window.
  3. Check that venting is within specifications (see Section 3.3 of manual). Long vent lengths, venting with more than three elbows, blocked vent or combination venting may cause this failure.
  4. Check that flue gas limiter connector and spade connections are secure.
  5. Unplug heater and check the two main plug connections inside the control board.

Jan 22, 2009 | Bosch & Tankless LP Hot Water Heater

1 Answer

Lpg spa heater cuts out at 86 degrees....


Is this an indoor heater? Vent could be blocked.

Dec 15, 2008 | Sta Rite Sta-Rite Max-E-Therm High...

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