Navien boilers manufacture oil and gas eco-friendly boilers from their main plant, based in Korea. In this article, we will cover all error codes and fault codes related to Navien boilers to allow you to identify the issue with your Navien boiler.
Before that, let’s learn a little bit about Navien and what they stand for. Founded in 1978 as Kyungdong Machinery Co. Ltd, they released their first boiler in 1979. In 1988, they were the first in Asia to release a ‘turbo’ condensing gas boiler.
In 1991 they changed their company name to Kyungdong Boiler Co. Ltd and launched their Symphony and Harmony ranges of wall-hung boilers. In 2002 they began exporting gas boilers to the U.S and in 2006 set up Navien America Inc. It wasn’t until 2014 that they started installing trial boilers in the U.K, with Navien UK Ltd being set up later that year.
While Navien has been operating as a boiler company in some form or other for over forty years, they haven’t been in the U.K for that long. In those forty years, they have racked up an impressive array of awards within Korea and some global awards too. But what do customers think about Navien boilers?
If we take a look at Navien Boiler UK reviews over on Trustpilot, it doesn’t look too bad at first glance. 4.1 out of 5 is a pretty solid score. However, 16% of Navien’s reviews on Trustpilot are negative, which is a bit concerning. What’s also concerning is that they only have 25 reviews posted. When you take a look at the positive reviews, many of them are unverified as customers, additionally, many of them are written by heating engineers that fit Navien boilers, not customers.
There isn’t much else to be found online regarding Navien boiler reviews. This is quite odd for such a large company that’s been operating in the U.K for a few years now. From speaking to WarmInstallers (WarmZilla heating engineers), they don’t rate Navien very highly but they often can’t agree on what pack of biscuits they want.
Compared to a top boiler brand with over 22k reviews on Trustpilot like Worcester Bosch or 26k reviews with Baxi; Navien represents a bit of an unknown when it comes to reviews. You may be better off going with a boiler manufacturer that you can rely on a bit more for build quality and customer service. Or, if you’re a bit more devil may care, then get a Navien and installed – be sure to leave a review in a few years to let us know how it went.
If your boiler is getting on in years or it’s not the first time it’s broken down and you think that any more money put into fixing your boiler would be wasted money; then get a new boiler quote from WarmZilla. It only takes a few minutes of answering some simple questions about your home and we’ll show you a list of boilers suitable for your heating needs.
With WarmZilla you can pay for your boiler using our boiler finance options. 0% APR finance is available over 2 years on selected boiler models. We guarantee to offer the cheapest combi boilers on the market.
Navien offers a small range of combi and system boilers with different kW options to suit different sized homes. Navien is a budget boiler brand, so they are quite cheap but they aren’t as reliable as more premier boiler brands such as Worcester Bosch.
We provide these error codes to help you identify the issue with your Navien boiler and hopefully fix it yourself. If you identify an internal issue with your Navien boiler then you will need to contact a Gas Safe Engineer to come and take a look.
Check out the table below to find your Navien error code and see what the fault code on your Navien boiler relates to. Navien fault codes are generally the same across all their boilers, which makes it easier to identify the issue with your boiler.
Error / Fault Code
Combi and System
|003||Ignition failure – manual reset needed|
|Combi and System||004|
False flame error – the boiler will auto-reset
|Combi and System||012|
Flame loss – reset the boiler
|Combi and System||016||Heat exchanger overheated – try manually resetting the boiler|
|Combi and System||030||Abnormal exhaust temperature – try manually resetting the boiler|
|Combi and System||046||Abnormal operation: Heat exchanger overheating – the boiler should auto-reset|
|Combi and System||047||Abnormal operation: Exhaust thermostat error – a manual reset is needed if it the boiler doesn’t auto-reset|
|Combi and System||060||Abnormal operation: Dual venturi limit switch – boiler will auto-reset|
|Combi and System||109||Abnormal operation: Fan error – the boiler needs resetting|
|Combi and System||110||Exhaust blockage (condensate blockage) – reset the boiler|
|Combi and System||127||Abnormal operation: Air pressure switch (APS) issue – reset the boiler|
|Combi and System||205||Heating supply thermistor open or short circuit – boiler should auto-reset|
|Combi and System||218||Alarm error: Heating return thermistor open or short circuit|
|Combi and System||302|
Low water pressure – boiler should auto-reset
|Combi and System||352|
High water pressure – boiler should auto-reset
|Combi and System||353||Abnormal operation: Water pressure sensor error – boiler should auto-reset|
|System||407||Abnormal operation: Hot water outlet thermistor – alarm error|
|System||421||Abnormal operation: Cold water inlet thermistor Auto reset should automatically occur|
|Combi and System||480|
Abnormal operation: External domestic hot water (DHW) tank outlet thermistor – alarm error
|Combi and System||515||Abnormal operation: Relay feedback (PCB) – the boiler needs to be reset|
|Combi and System||517||Abnormal operation: Dual in-line package (DIP) switch setting (PCB) – boiler needs to be reset|
|Combi and System||594||Abnormal operation: EEPROM (PCB) – contact an engineer|
|Combi and System||615||Abnormal operation: Input and memory (MCU) – try resetting the boiler|
|Combi and System||740||Abnormal operation: Outdoor temperature sensor – boiler should automatically reset|
|Combi and System||782||Abnormal operation: Main panel communication – boiler should auto-reset|
Below is a complete list of Navien boiler manuals courtesy of our friends over at freeboilermanuals.com:
- Navien LCB 700 Combi 21 LC
- Navien LCB 700 Combi 21 LCX
- Navien LCB 700 Combi 28 LC
- Navien LCB 700 Combi 28 LCX
- Navien LCB 700 Combi 36 LC
- Navien LCB 700 Combi 36 LCX
- Navien LCB 700 Regular 21 RS
- Navien LCB 700 Regular 21 RSX
- Navien LCB 700 Regular 28 RS
- Navien LCB 700 Regular 28 RSX
- Navien LCB 700 Regular 36 RS
- Navien LCB 700 Regular 36 RSX
- Navien LCB 700 System 21 LS
- Navien LCB 700 System 21 LSX
- Navien LCB 700 System 28 LS
- Navien LCB 700 System 28 LSX
- Navien LCB 700 System 36 LS
- Navien LCB 700 System 36 LSX
- Navien NCB 24L SWE Installation
- Navien NCB 28L SWE Installation
- Navien NCB 34L SWE Installation
- Navien NCB 40L SWE Installation
- Navien NCB 24L SWE Service
- Navien NCB 28L SWE Service
- Navien NCB 34L SWE Service
- Navien NCB 40L SWE Service
- Navien NCB-24 LDWE
- Navien NCB-28 LDWE
- Navien NCB-34 LDWE
- Navien NCB-40 LDWE
- Navien NCB-24 LDWE LPG
- Navien NCB-28 LDWE LPG
- Navien NCB-34 LDWE LPG
- Navien NCB-40 LDWE LPG
- Navien NCB-20 LHWE
- Navien NCB-23 LHWE
- Navien NCB-28 LHWE
- Navien NCB-33 LHWE
- Navien NCB-20 LHWE LPG
- Navien NCB-23 LHWE LPG
- Navien NCB-28 LHWE LPG
- Navien NCB-33 LHWE LPG
- Navien NCM-1130HH
- Navien NPE 24 AWE
- Navien NPE 24 SWE
- Navien NPE 31 AWE
- Navien NPE 31 SW