KevinL
New Member
Hi All,
I have a Navien NPE 240 A2 that was installed 3 months ago. I've noticed that in the mornings/first time I call for hot water the tankless will go through 4 short cycles before stabilizing and delivering hot water. The odd thing is the flow says 4.4-4.8 gpm which is inaccurate as I'm only opening a sink or shower at roughly 1-1.5 gpm.
Here is the events that happen when I call for hot water
- Start up
- Flow rate says 4.4-4.8 gpm for a second (sounds like a jet engine and the window flashes a bright blue flame)
- Post Purge
- Repeat
This must happen 4 times before hot water is delivered to the fixtures. If I stop it short (maybe 2 or 3 cycles) before the 4 cycles completes then the next time I call for hot water it must cycle through 4 times before hot water is delivered. The odd thing is throughout the day when I call for hot water after it's completed this 4 start up cycle it works flawlessly. I open a sink or shower and starts up and delivers hot water very quickly.
The advanced menu flame loss counter consistently increases (now in the 650 range after 3 months). 2nd, 3rd, 4th, etc ignition counts are 0 or minimal. I get ZERO error codes though and the hot water heater works fine after the 4 cycles. I'm more so worried about excess wear and tear and obviously the long delay the first time I call for hot water during the day.
Here are the things I've done to troubleshoot
- Cleaned air intake filter
- Switched electrical outlets
- Left the front cover off overnight and during start up to promote airflow
- Closed hot water outlet from the tankless and opened hot water taps to check for cross plumbing
- Close hot water outlet and attached a hose to hot water service valve to check for water pressure irregularities
- Factory reset
- Recirc is off (used internal recirc for a few days wondering if that may help, it did not)
Any advice, comments or suggestions are greatly appreciated. Thanks again!
I have a Navien NPE 240 A2 that was installed 3 months ago. I've noticed that in the mornings/first time I call for hot water the tankless will go through 4 short cycles before stabilizing and delivering hot water. The odd thing is the flow says 4.4-4.8 gpm which is inaccurate as I'm only opening a sink or shower at roughly 1-1.5 gpm.
Here is the events that happen when I call for hot water
- Start up
- Flow rate says 4.4-4.8 gpm for a second (sounds like a jet engine and the window flashes a bright blue flame)
- Post Purge
- Repeat
This must happen 4 times before hot water is delivered to the fixtures. If I stop it short (maybe 2 or 3 cycles) before the 4 cycles completes then the next time I call for hot water it must cycle through 4 times before hot water is delivered. The odd thing is throughout the day when I call for hot water after it's completed this 4 start up cycle it works flawlessly. I open a sink or shower and starts up and delivers hot water very quickly.
The advanced menu flame loss counter consistently increases (now in the 650 range after 3 months). 2nd, 3rd, 4th, etc ignition counts are 0 or minimal. I get ZERO error codes though and the hot water heater works fine after the 4 cycles. I'm more so worried about excess wear and tear and obviously the long delay the first time I call for hot water during the day.
Here are the things I've done to troubleshoot
- Cleaned air intake filter
- Switched electrical outlets
- Left the front cover off overnight and during start up to promote airflow
- Closed hot water outlet from the tankless and opened hot water taps to check for cross plumbing
- Close hot water outlet and attached a hose to hot water service valve to check for water pressure irregularities
- Factory reset
- Recirc is off (used internal recirc for a few days wondering if that may help, it did not)
Any advice, comments or suggestions are greatly appreciated. Thanks again!