Error Code - Paloma PH2-20R OFN Engineering Handbook

90 – Error Code
Explanation: The unit detected blockage in the venting during pre-purge cycle. This Error Code will occur BEFORE unit goes to
ignition.
Possible Causes:
• VENTING
Visually inspect venting for possible blockage and/or recirculation of exhaust.
1. Approved Venting Materials
2. Approved Vent Terminations
3. Vent Lengths
4. Location Of Vent Termination (Recirculation of exhaust)
5. Blocked Venting
6. Venting Not Sealed Properly
SVC 820-Tankless Gas Trouble Shooting Manual
VENTING:
**REFER TO USE & CARE MANUAL**
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