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 I have a Lifebreath 195 DCS .Controls are on the cabinet itself as it does not have any remote control units. The blower was replaced last year and the unitis plugged into  a timer so that it will cycle on/off. I consulted with a local heating contractor about installing a remote wall control panel such as the 99-PXPL03 . They informed me that it would work with my unit. I purchased the unit through an authorized HVAC supply and had the contractor install the unit.
It will power up and go through all the settings but will not control the HRV. Further research indicates that I may need to update my unit with kit #62-214UPR but the contractor is not able to confirm if this kit is compatible with my unit .
Any thoughts ?

Can someone share/upload CSA B51 Code?

Does that mean your thermostat has no C wire connected?  Did this problem start happening after this thermostat was installed?

I have found HRV interlock wiring back feeding to the AC. If you have one interlocked with the furnace make sure it's using the 3 wire method and not the 2 wire method.  There may also be a condensate pump safety or anti ice control indoors, installed on that 24V circuit.  You can bypass one at a time to see if the problem stops.

Is this installed with a non A2L furnace?  If they installed an R32 integration board, I would check to see where they attached the Y and C from OD unit.  Make sure they are wired to the black molex plug on the integration board, not the green one.

1yr old HVAC 4 ton heat pump. I have checked all wire nuts and wire connections are tight on inside unit, outside unit and thermostat. Thermostat is brand new Honeywell installed with batteries. HVAC tech checked all R32 Freon numbers and they are correct.

Randomly the outside unit will false start meaning I hear a loud click (I assume is the contactor) but immediately it shuts off with plunger sucking in and back out going from 26v to 0 immediately (click click). When this happens the inside unit turns on and the blower is running. Inside runs outside doesn't. After a few minutes delay the outside unit clicks and starts running normally with the inside unit.  This has been going on since this system was installed Aug 2025.

Each time the outside unit does this quick click click on and off, the very next time it starts normally. It's random though. The system might run 4 or 5 times in a row and the very next one it click click on and off.

Anyone ever seen this?

I took and passed the 313D exam a few years ago with the help of this forum. Now I'm preparing to challenge the 313A exam and looking for study materials or other resources to help with the preparation.

I was able to find quite a bit of useful material for the 313D, but I haven't been able to find anything similar for the 313A.

If anyone has any study guides, practice exams, notes, or other resources they'd be willing to share, I'd really appreciate the help. Thanks in advance!

Does the display say "Standby" or "No Demand," with no flame icon and the burner is still firing?

I noticed our Triangle Tube Prestige Solo 110 boiler is on constantly. This is so even if there is no call for heat from any zone, and even if the DHW tank temperature is okay.
I can disconnect the thermostats, the aquastat sensor, even the ambient air temp sensor, and the boiler keeps heating. And none of the circulation pumps are active, so the only warm pipes are those adjacent to the boiler.
The main circuit board is identified as a PTRKIT509. Could it be defective?

Anybody had any experience with receiver gas binding?  I have a system that's tripping the 410 psi HP cutout on the compressor, but has 100psi lower liquid line pressure.  It only does it on hot days, and there is NO restriction between the compressor and the receiver.  I did some reading, and a receiver that's warmer than the condenser can cause this, and Copeland calls it receiver gas binding.

Download the TSSA Media Release - Here

QuoteToronto, ON, September 22, 2026 – Upper Canada Fuels pleaded guilty to an offence under the Technical Standards and Safety Act, 2000 and has been fined $10,000 plus 25% victim fine surcharge for failing to provide the required supervision while servicing a gas furnace.

In April 2025, Upper Canada Fuels was called to service a furnace in a home in Marysville, Ontario. An Upper Canada Fuels technician, who holds a G3 gas technician certificate, attended the home to service the furnace.

The following day, the homeowner heard a loud noise from the mechanical room where the furnace was located. When he entered the room, the homeowner detected a strong burning smell and called local fire services. The propane supply serving the residence was shut off by the fire department and there were no injuries.

An investigation by Technical Standards and Safety Authority found that Upper Canada Fuels did not have a G2 certified technician on site to provide the required supervision when the G3 gas certificate holder performed the work on the furnace.

Following the incident, Upper Canada Fuels took steps to address the issue, including enrolling more employees in G2 certification programs.

Gas technician certification is a structured progression in Ontario with three levels, beginning with the entry level, G3, and progressing to G2 and to the highest level, G1. Only certified fuels safety technicians can perform regulated work, such as installing, maintaining and altering equipment, devices, or systems in the fuels industry. All certificates come with specific training and/or practical experience requirements. When repairing or servicing a gas appliance, a G3 certificate holder is required to have on-site supervision of a G2, G1 or DA (Domestic Appliance Technician) certificate holder.

I wonder why they didn't complete G3 sign off package.  Then a G3 can perform those duties under general supervision instead of direct supervision.

Hello All,
I'm working on an old RR car that has an old, Alco T-type expansion valve that sits atop an Alco multi outlet radial distributor.  Bother the valve and the distributor are obsolete.  I'd like to find an old Alco expansion valve catalog from the late 1950s or early 1960s.  Does anybody have a copy they can share?
Thanks!!
E-Bob