Under RTA 2004 s.67, a notice of termination for rent arrears requires a 14-day warning notice before the termination notice may be served. If the tenant has evidence of partial payment that was not credited at the time the warning notice was prepared, the dispute may turn on whether the warning notice was properly served and whether the arrears stated were accurate at the date of service. Three RTB decisions support this analysis; one runs the other way on facts where the warning notice was correctly served.