BASIC RP TROUBLESHOOTING:
Symptom: Relief valve will not open with gauge not dropping to zero.
Cause: Leaking #2 shutoff valve.
Symptom: Relief valve will not open with gauge dropping to zero.
Cause: Relief valve stuck in closed position.
Symptom: Relief valve opens when testing #2 check valve.
Cause: Fouled #2 check valve or disc compression.
Symptom: Relief valve drips constantly with apparent first check reading less than 5 psi.
Cause: Fouled #1 check valve.
Symptom: Relief valve drips constantly with apparent first check reading 5 psi or greater.
Cause: Fouled relief valve.