U.S. Boiler Company · Error codes
U.S. Boiler PVG 89 — Communication Lost
89
Communication Lost. Communication was lost, so check the wiring between the control and the IQ Zone Panel or IQ Reset Card. The table classifies it as Error.
Applies to
This communication or network fault code is displayed by the IQ Boiler Control (Err display) on PVG models (PVG3 through PVG9), as documented in PVG Gas-Fired Boiler Installation, Operating and Service Instructions, doc 103997-07 (8/14), Section X IQ Boiler Control error codes (103997-07). Codes can differ between controller generations, so always check the manual that matches your unit.
Controller: IQ Boiler Control (Err display). Source manual: 103997-07 (2014-08).
Why a code is not a diagnosis
A communication code involves the link between controls (cascade, remote, sensors on a bus). Another unit being off, a wiring fault or an address conflict can all produce it.
Safe things to observe
- Check that every appliance in a multi-unit plant has power.
- Report the code together with any other codes on the system.
Do not
- Do not re-address or rewire control networks yourself.
How professional service helps
- A technician verifies power, wiring and settings across the connected units.
- Combustion and safety devices are verified with an analyser and the manufacturer's procedure after any repair.
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Parts and service
Parts commonly involved
These parts appear in the documented text for this alert. A code reports a condition, not a failed part — a technician confirms the cause by testing before anything is replaced.
Zone control panel and relays
A zone control panel is the switching brain of a multi-zone hydronic system: it reads each thermostat, opens the right zone valves or starts the…
What a technician checks →
Service for this alert
- Gas Boiler Repair
Licensed gas technicians from ROMA Heating & Cooling diagnose and repair residential and light-commercial gas boilers across…
Every boiler part explained — what it does, how it fails and what a technician checks.
Documented for U.S. Boiler Company PVG.
Frequently asked questions
Can I clear this code myself?
Clearing a code without fixing its cause usually just brings it back. Note the code, check the safe items on this page, then call a licensed technician. If your appliance manual describes a user reset for this exact code and it stays away, no call may be needed.
Boiler locked out? Call with the alert text ready.
The brand, model and this alert are passed along when you request service online, so the technician arrives prepared.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
- PVG Gas-Fired Boiler Installation, Operating and Service Instructions, doc 103997-07 (8/14), Section X IQ Boiler Control error codes · 103997-07 · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.