Rinnai Error Code Block 01: External safety contact open (Boiler)
Rinnai error code Block 01 on a boiler means: External safety contact open. It is also called Rinnai diagnostic code Block 01.
Homeowner? What Rinnai code Block 01 means for you
Check, then call Your boiler is reporting: External safety contact open. This is often caused by something simple. Try the safe checks below; if the code returns, book a service call before it turns into a no-heat or no-hot-water emergency.
Safe things you can check yourself
- Check the thermostat: right mode (Heat or Cool), set a few degrees past room temperature, and fresh batteries if it uses them.
- Make sure the unit has power: its on/off switch (often looks like a light switch near the unit) is ON and the breaker in the electrical panel is not tripped.
- Look at the pressure gauge on the boiler. If it reads much lower than usual or near zero, or water is leaking, call a technician.
- Outside, make sure the intake and exhaust pipes or vent cap are not blocked by snow, ice, leaves or a nest.
- Check that the boiler gas valve is open (handle in line with the pipe).
- Try one reset: turn the power off for 30 seconds, then back on. If the code comes back, stop resetting and call a technician.
Call (647) 657-2977Book a service call
Licensed technicians serving Vaughan, Toronto and the GTA.
What does Rinnai error code Block 01 mean?
Temporary block: the external safety contact wired to the boiler is open, so the burner is held off.
Applies to: E50CRN; E75CRN; E75CRP; E110CRN; E110CRP
Common causes of Rinnai code Block 01
- External safety device tripped
- Link between terminals 24 and 25 missing or broken
Other Rinnai Boiler codes
All Rinnai Boiler error codes →
Rinnai code Block 01: homeowner questions
What does Rinnai code Block 01 mean?
External safety contact open. Temporary block: the external safety contact wired to the boiler is open, so the burner is held off.
Is it safe to keep using my boiler with code Block 01?
It depends on the cause. This is often caused by something simple. Try the safe checks below; if the code returns, book a service call before it turns into a no-heat or no-hot-water emergency.
Can I reset Rinnai code Block 01 myself?
You can try one reset (power off for 30 seconds, then on). If Rinnai code Block 01 comes back, the cause is still there and a licensed technician should check it.
Who can fix Rinnai code Block 01 near me?
Aurora Star Tech Inc. repairs Rinnai boilers in Vaughan, Toronto and across the GTA. Call (647) 657-2977 or book a service call online.
Homeowner help: Boiler Not Heating: What to Check
Troubleshooting guides
- No heat or some zones cold All brands · Boiler
- Automatic de-aeration program (A xx, 17 min) Rinnai · Boiler
- Central heating works, no domestic hot water Rinnai · Boiler
- Change a parameter in the PARA chapter Rinnai · Boiler
- DHW temperature drops Rinnai · Boiler
- Force the burner on for combustion checks (SERV function 1) Rinnai · Boiler
- Heating system warms without a call Rinnai · Boiler
- Hot water works, no central heating Rinnai · Boiler
- Ignition safety test (forced E02 lockout) Rinnai · Boiler
- Insufficient hot water quantity Rinnai · Boiler
- Open the installer level (code C123) Rinnai · Boiler
- Open the parameter settings menu on the PC board Rinnai · Boiler
- Radiators not hot enough or slow to heat Rinnai · Boiler
- Read the technical read-out and error history Rinnai · Boiler
- Reset the SERVICE reminder (8000 h counter) Rinnai · Boiler
- Restore factory parameters (Copy) Rinnai · Boiler
- Venturi reset on the PC board (code 170) Rinnai · Boiler
- View the last nine error codes (DHW + Up) Rinnai · Boiler
Source: Rinnai E-Combi Series Installation & Servicing Instructions (8U516009 V0116), p.71-72 (15.1, 15.2). Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.