Code 54 High Exhaust Gas Temperature Error code 54 Exhaust Gas Temperature”. If the exhaust temperature exceeds 163°F the water — “High heater will reduce it’s input Btu firing rate. If after 120 seconds the exhaust gas temperature remains above 163°F, the unit will shut down and flash a code 54. 1. Check around vent termination to ensure clearances were met. 2. Check for restrictions in vent system intake and exhaust ports. 3. Verify venting is within vent clearance specifications and lengths per manufactures’ recommendation. 4. Ensure unit was installed on gas type that matches rating plate gas type. 5. WARNING: You must be qualified to service gas systems before proceeding. Verify force low and high fire manifold gas pressures, check using a manometer. Procedure for checking these pressures can be found on the back side of the front cover. If you need assistance contact Rinnai technical services 24/7 for details on how to check these pressures. You must have a manometer to check operating gas pressures.
Code 54 High Exhaust Gas Temperature Error code 54 — “High Exhaust Gas Temperature”. If the exhaust temperature exceeds 163°F the water heater will reduce it’s input Btu firing rate. If after 120 seconds the exhaust gas temperature remains above 163°F, the unit will shut down and flash a code 54. 1. Check around vent termination to ensure clearances were met. 2. Check for restrictions in vent system intake and exhaust ports. 3. Verify venting is within vent clearance specifications and lengths per manufactures’ recommendation. 4. Ensure unit was installed on gas type that matches rating plate gas type. 5. WARNING: You must be qualified to service gas systems before proceeding. Verify force low and high fire manifold gas pressures, check using a manometer. Procedure for checking these pressures can be found on the back side of the front cover. If you need assistance contact Rinnai technical services 24/7 for details on how to check these pressures. You must have a manometer to check operating gas pressures.
2017%20Water%20Heater%20Knowledge%20Base%2003152017GW%20(Master%20Copy).docx